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        1. ---Must we leave the classroom now?
          ---No, you _____. You _____ leave after the bell rings.
          A.mustn't; are allowed toB.don't have to; might
          C.needn't; canD.can't; are supposed to
          C

          試題分析:must的含義是必須一定,其否定形式mustn’t表示禁止的含義。故must的否定回答一般借助于needn’和don’t have to來(lái)構(gòu)成,句意:我們現(xiàn)在必須離開(kāi)教室嗎?——不,你們不必。你們可以在鈴響之后離開(kāi)教室。在表示可能時(shí),might表示推測(cè)語(yǔ)氣,can表示客觀的能力,結(jié)合語(yǔ)境可知選C。
          點(diǎn)評(píng):must的否定形式是常考內(nèi)容之一,結(jié)構(gòu)比較固定,熟記即可。
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