One of the guards ______ when the general came in, which made him very angry.A、h

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问题 One of the guards ______ when the general came in, which made him very angry.

选项 A、has slept
B、were sleeping
C、slept
D、was sleeping

答案 D

解析时态用法。主语是one of the guards，谓语动词要用单数形式。由于从句是过去时，而主句表示的是在过去某个时间正在发生的动作，因此要用过去进行时，答案为D。

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