【題目】You needn't finish the work today.
A.don't have to
B.can't
C.mustn't

【答案】A
【解析】句意：你今天不必要完成工作。needn't=don't have to意為“不必要”，can't意為“不能，不可能”，mustn't意為“禁止，不許”，故選A。

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