iswas sleeping
dropsdropped
when 这个词在连接两个句子时,一般会出现进行时态；
因为sleep是延续性动词,可以用进行时态；
而drop是短暂性动词,不可用进行时态.
因为没有时态提示,所以现在和过去时态都可以,但是句意上,还是过去时态好一些
His cat-----------(sleep)on the floor when he----------(drop
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