They must be working      because they have a lot of work to do yesterday.
A．a(chǎn)ny momentB．a(chǎn)t the momentC．just a momentD．the moment
B

試題分析：句意：他們那時一定在工作，因?yàn)樗麄冏蛱煊泻芏喙ぷ饕觥ny moment任何時候；at the moment 那時；just a moment 稍等一下；the moment（that）="as" soon as從語境中可知，強(qiáng)調(diào)昨天那個時候，所以用at the moment。故選B。 
考點(diǎn): 考查名詞短語的用法。
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