Mr. Smith______ to Beijing, for I saw him in the library just now.

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问题 Mr. Smith______ to Beijing, for I saw him in the library just now.

选项 A、couldn’ t have gone
B、mustn’ t have gone
C、shouldn’ t have gone
D、needn’ t have gone

答案A

解析根据句意可知，本句表示的是对过去情况的否定推测，所以应用couldn’t have gone，意为“不可能去了……”。没有mustn’t have gone这种用法；shouldn’t have gone意为“本不应该去”；needn’t have gone意为“没必要去”。故选A。

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