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        1. 【題目】—Can you stay for lunch?

          —Sorry, I __________. I have to go back home now.

          A.can'tB.needn'tC.mustn'tD.shouldn't

          【答案】A

          【解析】

          句意:——你能留下來吃午飯嗎?——對不起,我不能。我現(xiàn)在必須回家了。

          can't不能;needn't不必; mustn't 禁止;shouldn't不應該。根據(jù)“Sorry及下文“I have to go back home now.”可知,這里是不能,用can't,根據(jù)題意,故選A。

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