Sentence Correction: Comparative Questions – Overview

The GMAT is considered by many to be ***** difficult than the TOEFL is.

The word as cannot appear with than. As is used to show similarity or equality and is usually followed by another as:

The GMAT is considered by many to be as difficult as the TOEFL is.

Than is used to show a difference, an inequality or a dissimilarity between people/things.

The correct answer is thus more.

Correct! 

more

as

I don't know

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