I was surprised by __________ understand the difficult concepts. ...

[ Grammar ]

I was surprised by __________ understand the difficult concepts.

A. be able to

B. being able to

C. to be able to

D. been able to

Select your answer:
A B C D E

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A. it

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A. You can prevent going to the doctor for any disease.
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I _____ (hurt) my finger. It is okay now.

A. has hurt

B. hurted

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The smart boy answered every question ____________.

A. honestly

B. truthfully

C. correctly

D. politely