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【题目】My friend, Tom, left New York in 1976 and _____ since then.

A. hadn't been heard of

B. hasn’t been heard of

C. hasn't heard of

D. hadn't heard of

【答案】B

【解析】考查动词的时态和语态。since then常和现在完成时连用,Tomhear为被动关系,句意:我的朋友汤姆1976年离开纽约,从那时起我就没有收到过他的消息。

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