[题目]I didn't know ．A．when would the train arriveB．where could I get the bookC．what has been doneD．who left the message 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】I didn't know ____．

A．when would the train arrive

B．where could I get the book

C．what has been done

D．who left the message

【答案】D

【解析】

根据主句谓语动词，宾语从句的时态应该用过去的某个时态，排除C，宾语从句的语序用陈述语序，故排除A,B，因此正确答案是D.

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