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英语单选·~15.He did not arrive until the meeting was nearly over

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英语单选·~
15.He did not arrive until the meeting was nearly over,for the simple reason is that he _____ asleep while watching television.
A.had fallen b.has fallen c.fell d.was falling
为什么选A呢 我觉得是C 啊···
英语单选·~15.He did not arrive until the meeting was nearly over
had fallen
过去完成时
表示过去的过去
他看电视是过去
在过去看电视时之前已经睡着了
所以用过去完成时
比较绕.
自己在体会下