问个被动语态问题....until their application had been sent to China a

来源：学生作业帮编辑：拍题作业网作业帮分类：英语作业时间：2024/05/06 06:52:13

问个被动语态问题.
...until their application had been sent to China and an answer received ...
为什么不是"an answer was received
刚看到网上有写是an answer had been received 的省略句。
但怎么知道这是省略句而不是语法错误呢？

英语句型有种平行结构.如果用and或but引导两个平行并列句,后一句的动词和前面一句动词如果相同或有相同的助动词部分,可以省略动词的一部分或全部.如;Some people dream more ；others （dream) less. You are a doctoe and I a lawyer. 此句就是个用and引导的平行句,后面应该省略了had been.即an answer had been received .如果你知道了这一点就不会把他看成语法错误了.

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