9．--Could I play chess at the moment？
--No，you _____．You haven't washed the dishes yet．（　�。�
A．couldn'tB．needn'tC．Shouldn'tD．can't

分析 --我這會兒可以玩一下象棋嗎？
--不，你不能，你還沒有洗盤子呢．

解答 答案：D．needn't不必；shouldn't不應該；can能，能夠．Could是can的過去式，用于一般現(xiàn)在時態(tài)表示委婉的請求建議等語氣．couldn't 是can′t的過去式和虛擬式．在實際應用中，could′t是can′t的禮貌用法，含有不情愿的意思，加上有虛擬的含義，語氣較弱．表示否定時can't比couldn't的否定意味更重．根據(jù)句中的"You haven't washed the dishes yet"，可知該空應該用can't，表示拒絕；故選D．

點評 情態(tài)動詞的考查是初中英語考查的重點，平時學習中一定要熟記這些詞的基本詞義及用法上的不同，注意其用法及在句子中表達語氣的不同，結(jié)合語境選擇合適答案．

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