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

Other quiz:

Verb Tenses › View

He (not eat) dinner last night.

A. not eat

B. not eating

C. not ate

D. not eaten

Types of Sentence Structures › View

The platypus has venom-producing glands, which are rare among mammals, but its venom is not generally lethal to humans.

A. simple

B. compound

C. complex

D. compound-complex

Present Perfect and Simple Past Tense › View

I _____ (hurt) my finger. It is okay now.

A. has hurt

B. hurted

C. hurt

D. have hurt

E. have hurted

Grammar › View

The smart boy answered every question ____________.

A. honestly

B. truthfully

C. correctly

D. politely