问题补充：
—What time will Mr. Green be back to China?
—Sorry. I don’t know .
A. when did he go broad
B. why he is going abroad
C. how soon will he be back
D. how long he will stay abroad
答案：
A. when did he go broad
B. why he is going abroad
C. how soon will he be back
(答案→)D. how long he will stay abroad
解析：英语宾语从句中一般为陈述语序。句意：格林先生什么时候回到中国?根据上文,可知下文描述的是将来的时间,选项C为倒装语序,故选D.抱歉,我不知道他会在国外呆多久.
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