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(shí)起飛嗎？
-恐怕不行．因?yàn)樘鞖猱惓：洌S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(yǔ)氣；can have done表示對(duì)過去事實(shí)的不肯定推測(cè)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(cè)，故選C．

點(diǎn)評(píng) 情態(tài)動(dòng)詞的用法是英語(yǔ)中常考的語(yǔ)言點(diǎn)．通�？疾榈姆绞接刑摂M和推測(cè)，本題考查的是情態(tài)動(dòng)詞的推測(cè)用法．學(xué)習(xí)時(shí)要注意積累．

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