【題目】There’s no light on—they ______ be at home.
A.can’t
B.mustn’t
C.needn’t
D.shouldn’t

【答案】A
【解析】A. can’t表示對(duì)現(xiàn)在情況的否定猜測(cè)或判斷,意為“不可能”;B. mustn’t表示禁止或不準(zhǔn);C. needn’t表示沒(méi)必要做某事;D. shouldn’t表示不應(yīng)該做某事;句意:燈沒(méi)亮—他們不可能在家。根據(jù)所提供的情景“There’s no light on...”可判斷出他們不可能在家,故選A。

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