One of the guards_____ when the general came in, which made him very angry.
One of the guards_____ when the general came in, which made him very angry.
A、has slept
B、were sleeping
C、slept
D、was sleeping
【正确答案】:D
【题目解析】:D 过去进行时态。当长官进来的时候其中一个士兵在睡觉,这让他很生气。When引导的时间状态从句中,came in 用的是过去时,所以士兵正在睡觉的动作为过去进行时。
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