—The light in his office is still on. Do you know         ?
—In order to prepare for tomorrow’s meeting.
A．if he works hardB．why he stays up so late
C．that he is so busyD．when he will stop working
B

試題分析：句意：他的辦公室的燈仍然亮著。你知道他為什么熬夜那么晚嗎？為了準備明天的會議。賓語從句的結(jié)構(gòu)：主語+謂語+連接詞+從句。從句在句中作賓語。從句要用陳述句的語序。如果主句是一般現(xiàn)在時，從句根據(jù)需要選擇時態(tài)，如果主句是過去時態(tài)，從句要用相應的過去時態(tài)。根據(jù)回答，可知上文在問熬夜的原因，故選B。
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