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If you _____ leave early on weekdays, do it quietly. The other classmates are also dying to have an early leave.
A.canB.mustC.shouldD.may
B

试题分析:句意:如果你在周内硬要早离开的时候,请悄悄的,其他的学生也渴望能早点离开。must此处在这里表示一种感情色彩,意为“偏要,硬要”,故选B
点评:情态动词中除了表示推测,基本意思以外,还可以表示一种感情色彩,如must表示偏要,一种责备的语气,而should表示一种非常惊讶的语气,意为“竟然”,在if的条件状语从句中还可以表示“万一”。
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