—The light in his office is still on. Do you know         ?
—In order to prepare for tomorrow’s meeting.

A．if he works hard B．why he stays up so late
C．that he is so busy D．when he will stop working

B

解析試題分析：句意：他的辦公室的燈還亮著，你知道為什么他熬夜那么晚嗎？為準(zhǔn)備明天的會(huì)議。根據(jù)回答可知上句在問原因，故選B。
考點(diǎn)：考查賓語從句的用法。

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