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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.會是誰呢?
---一定是瑪麗.她答應8:00到這里的.

解答 答案:D
根據本句的語境"There'ssomeone knocking on the door.有人在敲門"以及答語"It must be Mary…一定是瑪麗…"得知,"Who _____it be?"應該是表示推測.A must 表示比較肯定的推測,一定,只用于肯定句; B 需要  C shall 在疑問句中表示征求對方意見,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

點評 情態動詞表示推測的用法是考查的重點,所以要注意總結表示推測的情態動詞的用法及區別.

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