-IsJackinthenextroom? -Well,it’shardtosay.ButIhe...
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问题详情:
-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
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