因为before在这里是个连接词,引导了时间状语从句.后面的从句必须是个完整的句子,具有主谓宾结构
如果用receiving的话,那么就属于非谓语动词了,后面的从句没有谓语,那么句子就是个错误的成分残缺的错句.
下面的句子中,为什么用receive不用receiving?
3个回答
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