20．---________the plane have taken off on time？
---I'm afraid not．So many flights were delayed due to the bitterly cold weather．（　�。�
A．NeedB．ShouldC．CanD．Must

分析 -飛機(jī)能按時起飛嗎？
-恐怕不行．因為天氣異常寒冷，許多航班都延誤了．

解答 答案：C
題干中用了一般疑問句，表示不肯定的語氣；can have done表示對過去事實的不肯定推測或懷疑；need需要，should應(yīng)該，must一定．句意表達(dá)的是不肯定推測，故選C．

點評 情態(tài)動詞的用法是英語中�？嫉恼Z言點．通�？疾榈姆绞接刑摂M和推測，本題考查的是情態(tài)動詞的推測用法．學(xué)習(xí)時要注意積累．

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