— 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(lái)的考試做準(zhǔn)備,可知上文在問(wèn)你知道為什么他熬夜那么晚嗎?賓語(yǔ)從句的結(jié)構(gòu):主語(yǔ)+謂語(yǔ)+連接詞+從句。從句在句中作賓語(yǔ)。從句要用陳述句的語(yǔ)序。如果主句是一般現(xiàn)在時(shí),從句根據(jù)需要選擇時(shí)態(tài),如果主句是過(guò)去時(shí)態(tài),從句要用相應(yīng)的過(guò)去時(shí)態(tài)。但是從句是客觀真理,一般用一般現(xiàn)在時(shí)態(tài)。AD連接詞不正確,C語(yǔ)序不正確,根據(jù)句意,故選B。
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