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Sentence Correction: Preposition Questions - Split Constructions

A group of engineering students, dissatisfied with recent robotics projects, argued that robots could be used not only to mix cocktails but also to search and diffuse land mines, a weapon that threatens the safety of millions of innocent people around the world.

This answer choice is grammatically incorrect. The verb search requires a preposition in order to logically connect to land mines. The land mines should be searched for.

What helps us identify this question as a Split Construction question and identify the mistake is the following Stop Sign:

A split construction: Verb A + and/or + Verb B + object

Although this answer choice corrects the original Split Construction error by inserting the preposition for, it creates another grammatical error. In the GMAT, but also must be complemented by not only.

What helps us identify this question as a Parallelism question as well as identify the mistake is the following Stop Sign:

not only... but also...

Very well done!

This answer choice corrects the original Split Construction error by adding the required preposition for in order to logically connect the verb search to the noun land mines.

Although this answer choice corrects the original Split Construction error by inserting the preposition for, it creates another grammatical error. The same part of speech that follows not only should follow but also. In this answer choice, however, not only is followed by the noun (for) cocktail mixes whereas but also is followed by the verb to search.  

What helps us identify this question as a Parallelism question as well as identify the mistake is the following Stop Sign:

not only... but also...

Although this answer choice corrects the original Split Construction error by inserting the preposition for, it is grammatically incorrect. In the GMAT, not only must be complemented by but also, not just but.

What helps us identify this question as a Parallelism question as well as identify the mistake is the following Stop Sign:

not only... but also...

A group of engineering students, dissatisfied with recent robotics projects, argued that robots could be used not only to mix cocktails but also to search
A group of engineering students, dissatisfied with recent robotics projects, argued that robots could be used to mix cocktails but also to search for
A group of engineering students, dissatisfied with recent robotics projects, argued that robots could be used not only for cocktail mixes but also to search for
A group of engineering students, dissatisfied with recent robotics projects, argued that robots could not only be used to mix cocktails but to search for
Dissatisfied with recent robotics projects, a group of engineering students argued that robots could be used not only to mix cocktails but also to search for