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【题目】I didn’t know _______________.

A. when would the train arrive B. who left the message

C. what has been done D. where could I get the book

【答案】B

【解析】句意:我不知道谁留下的信息。本句考察宾语从句的语序和时态,宾语从句要用陈述句的语序;,当主句是一般过去时态时,从句使用过去的某一时态。故选B。

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