______ it is very late now, the researchers are still working in the lab.A、AsB、

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问题 ______ it is very late now, the researchers are still working in the lab.

选项 A、As
B、When
C、If
D、Although

答案 D

解析本题考查连词辨析。A项“随着”；B项“当……时”；C项“如果”；D项“虽然，尽管”。根据句意可知，此处连词应该起着转折的作用，与天很晚形成对比，故选D。

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