【題目】There is no light on--- they _______ be at home.

A.mustn’tB.can’tC.needn’tD.shouldn’t

【答案】B

【解析】

考查情態(tài)動(dòng)詞。句意:燈不亮——他們不可能在家。mustn't表示禁止;can't表示不可能;needn't表示沒(méi)必要shouldn't表示不應(yīng)該。根據(jù)燈沒(méi)亮推斷,他們不可能在家,是否定性推測(cè),用can't。故選B

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