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英语A and B which are very important have been studied.

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英语A and B which are very important have been studied.
A and B which are very important have been studied.
A and B are very important which have been studied.
这两句那个对,还是都对,为什么
第一个句子对,括号中是宪制性定语从句:
A and B (which are very important) have been studied.
第二个句子是错句,错在非限制性定语从句中的谓语东西错用为复数,应单数:
A and B are very important,which has been studied.