【題目】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：我不知道誰留下的信息。本句考察賓語從句的語序和時態(tài)，賓語從句要用陳述句的語序；，當主句是一般過去時態(tài)時，從句使用過去的某一時態(tài)。故選B。

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