2．--There'ssomeone knocking on the door．Who _____it be？
-It must be Mary．She promised to be here at 8：00．（　�。�
A．mustB．needC．shallD．can

分析 ---有人在敲門．會(huì)是誰(shuí)呢？
---一定是瑪麗．她答應(yīng)8：00到這里的．

解答 答案：D
根據(jù)本句的語(yǔ)境"There'ssomeone knocking on the door．有人在敲門"以及答語(yǔ)"It must be Mary…一定是瑪麗…"得知，"Who _____it be？"應(yīng)該是表示推測(cè)．A must 表示比較肯定的推測(cè)，一定，只用于肯定句； B 需要  C shall 在疑問句中表示征求對(duì)方意見，主要用于第一、三人稱，有"…好嗎？"，"要不要"D can 可能，一般用于疑問句或否定句．故選D

點(diǎn)評(píng) 情態(tài)動(dòng)詞表示推測(cè)的用法是考查的重點(diǎn)，所以要注意總結(jié)表示推測(cè)的情態(tài)動(dòng)詞的用法及區(qū)別．

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