She was quite sure that she ______ the door before she left the office.A、will lo

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问题 She was quite sure that she ______ the door before she left the office.

选项 A、will lock
B、would lock
C、has locked
D、had locked

答案 D

解析本题考查对时态的掌握。由句意“她很确信在离开办公室之前她锁上了门”可知，锁门的动作发生在过去时态be Sure之前，即“过去的过去”，所以要用过去完成时态。

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