2. 外语
  3. As he was stepping out of the office, Steven looked around the room again to see if he ______ anything behind.

As he was stepping out of the office, Steven looked around the room again to see if he ______ anything behind.

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问题 As he was stepping out of the office, Steven looked around the room again to see if he ______ anything behind.
选项 A、left
B、had left
C、has left
D、would leave
答案B
解析 时态题。根据句意可知，东西是否“落下”发生在史蒂文“看”之前，即表示“过去的过去”，故用过去完成时，因此B为答案。
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