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They must be working      because they have a lot of work to do yesterday.
A.any momentB.at the momentC.just a momentD.the moment
B

试题分析:句意:他们那时一定在工作,因为他们昨天有很多工作要做。any moment任何时候;at the moment 那时;just a moment 稍等一下;the moment(that)="as" soon as从语境中可知,强调昨天那个时候,所以用at the moment。故选B。 
考点: 考查名词短语的用法。
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