16．______ it have been the failure to pick up directions from the ground control that caused the air crash？（　�。�
A．MustB．CouldC．WouldD．Should

分析 可能是來(lái)自控制室的錯(cuò)誤指示導(dǎo)致這起飛機(jī)墜毀事件的嗎？

解答 答案B．
A項(xiàng)"必須，一定"；C項(xiàng)"將，將要；愿意"；D項(xiàng)"應(yīng)當(dāng)，應(yīng)該"；B項(xiàng)"能夠，可能"；分析句子結(jié)構(gòu)可知，該句是強(qiáng)調(diào)句型"It is/was…that…"結(jié)構(gòu)，去掉主干部分后結(jié)構(gòu)為"the failure to pick up directions from the ground control  caused the air crash"，來(lái)自控制室的錯(cuò)誤指示可能是飛機(jī)墜毀的原因之一，故選B．

點(diǎn)評(píng) 本題考查情態(tài)動(dòng)詞．解答此類題目關(guān)鍵是要讀懂句意，并且對(duì)每個(gè)情態(tài)動(dòng)詞的基本用法和特殊用法都要熟知，然后根據(jù)語(yǔ)境辨析鎖定答案．

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