3.

Answer and Explanation

Your Answer is

Correct Answer is B

Explanation

The relationship between poetry and expect is investigated here, which should be a passive relationship, that is, "poetry is expected", so the past participle is used as the attributive, and B is correct.

Item A: Make this sentence have two predicate verbs, wrong.

Item C: Active form error.

Item D: The attributive clause should be that was expected, so it is wrong.