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—I think the man over there must be Bob.
—It ______ be him. He has gone to Paris.

A．can’t

B．can

C．may not

D．mustn’t

解析試題分析：根據 He has gone to Paris.“他去巴黎了。”可知，本句應該是“它不可能是他�！惫逝懦鼴；“不可能”是can’t。而may not表示“不可以”，mustn’t表示“禁止做”故與題意不符。所以本題選A。
考點：本題考查情態動詞的用法。
點評：本題實際是考查情態動詞表示推測的情況，這很容易與以前學過的情態動詞的用法相混淆。情態動詞表示推測的情況，表示一般性推測用might、could表示“可能”；表示肯定推測用must表示“一定”；否定推測用can’t表示“不可能”。

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