— The light in his room is still on. Do you know _________?
— To prepare for the coming exam, I think.
A．if he works hardB．why he stays up so late
C．why is he so busyD．when he will stop working
B

試題分析：根據(jù)后文回答，我認(rèn)為在為即將到來的考試做準(zhǔn)備，可知上文在問你知道為什么他熬夜那么晚嗎？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(yīng)的過去時態(tài)。但是從句是客觀真理，一般用一般現(xiàn)在時態(tài)。AD連接詞不正確，C語序不正確，根據(jù)句意，故選B。
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