---_______ the plane have taken off on time?
--- I’m afraid not. The fog was too thick then.

A．Would B．Should C．Can D．Must

C

解析試題分析：這是一組對話。上文，飛機能按時起飛嗎？下文，我恐怕不能，霧太大了。would表示說話人的意愿或向?qū)Ψ教岢稣埱�，語氣比will婉轉(zhuǎn)，仍指現(xiàn)在時間；should 意為“應該” ，可表示勸告、建議、義務、責任等。表示推測，意為“可能”， 常用于否定句和疑問句中；must 表示主觀看法，意為“必須、一定”，根據(jù)題意，故選C。 
考點：情態(tài)動詞的用法
點評：情態(tài)動詞有具體的詞義，但也同助動詞一樣，需要與其他詞語一起構(gòu)成句子的謂語，另外情態(tài)動詞沒有人稱和數(shù)的變化，情態(tài)動詞后必須跟動詞原形。

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