Such birds have never been heard ______ at night.

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问题 Such birds have never been heard ______ at night.

选项 A、to be sung
B、are singing
C、to sing
D、sing

答案C

解析 hear后跟复合宾语，不定式都不带to，但这种句子如果变为被动结构，to就不能不要，根据题意本题答案为C。

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