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I must be off now. My friends ________ outside.
A.waitB.have waitedC.are waitingD.were waiting
C

试题分析:考查时态。根据上文的must be说明是对现在的情况进行说明,因为“must+动词原形”说明对现在的情况进行推测。故C正确。句意:我现在必须得走了,我的朋友在外面等我。
点评:时态的考查要放在上下文的语境中进行,同时也要注意句子的关键的时间状语。
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