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5.Ever since he fell ill,Peter ________ a fever day and night,worried that he's been infected with the Ebola virus.(  )
A.suffered fromB.has suffered from
C.suffers fromD.were suffering from

分析 自从生病,彼得就日夜发烧,担心自己感染了埃博拉病毒.

解答 答案是B.本题考查现在完成时;题干中的 ever since(自从)表示"自从过去某一时间起到现在",是现在完成时的标志词,since从句中用过去时,主句中必须用现在完成时;故选B.

点评 对时态的选择,要在把握时态的基本用法的基础上,根据具体语境和题干中的时间推断时态,同时关注特殊的结构.

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