______ 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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