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8.-Daddy,how much do you earn an hour?
-If you ______ know,20 an hour.(  )
A.mayB.mustC.canD.should

分析 ---爸爸,你一小时挣多少钱?
---如果你非要知道,一个小时20美元.

解答 答案B.
情态动词must除了"必需、应当","必然要、一定","很可能"等意思外,还可以用来表示一种与说话人愿望相反、不耐烦的感情色彩,此时,must一般译成汉语"偏偏""、非得""、偏巧".根据句子所表达的含义可知答案选B.

点评 本题考查情态动词的特殊用法.在平时的学习中既要注意情态动词的基本含义,也要注意情态动词的特殊意义,如must偏偏,非得;should竟然;mustn't禁止,千万不能;Shall用于所有人称,表示命令,警告,允诺;以及法律规定中要做的事情.

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