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

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