TO + ING

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by jaymw » Mon Apr 25, 2011 7:08 pm
Yep, sounds idiotmatic, although I have never seen this expression on an actual GMAT question.

This phrase is very similar in meaning and structure to the construction: key to doing sth.

You would rather say:

The key to understanding complex math problems is hard work.

than

The key to understand complex ...

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