题目内容

- What time will Mr. Brown be back to China?
- Sorry, I don't know______.
A．when did he go abroadB．why he is going abroad
C．how soon will he be backD．how long he will stay abroad
D

试题分析：句意：史密斯先生将什么时间回国？对不起，我不知道他将在国外呆多久。宾语从句的结构：主语+谓语+连接词+从句。从句在句中作宾语。从句要用陈述句的语序。如果主句是一般现在时，从句根据需要选择时态，如果主句是过去时态，从句要用相应的过去时态。AC语序错误。根据上句询问，故选D。
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