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-IsJackinthenextroom?        -Well,it’shardtosay.ButIhe...

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问题详情:

-IsJackinthenextroom?        -Well,it’shardtosay.ButIhe...

-Is Jack in the next room?

         -Well, it’s hard to say. But I heard him ______ at 5 o’clock.

A. sing               B. to sing        C. sang                    D. singing

【回答】

D

知识点:动词和动词短语

题型:选择题