. - The speaker is a tall man with glasses.
- Then it_____ be Mr. Smith, who is short and thin.

A．wouldn't B．won't C．mustn't D．can't

D

解析試題分析：句意：上文，這個說話的人是一個戴著眼鏡的高個子男子。下文，那不可能是史密斯先生，史密斯先生又矮又瘦。表示推測，用can't，選D。
考點：考查情態(tài)動詞

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