It is said that the early European playing-cards ______ for entertainment and education.A.were being designed B.have designedC.have been designed D.were designed但是design发生在it is said 之前为什么不用完成时呢?

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It is said that the early European playing-cards ______ for entertainment and education.A.were being designed B.have designedC.have been designed D.were designed但是design发生在it is said 之前为什么不用完成时呢?

It is said that the early European playing-cards ______ for entertainment and education.A.were being designed B.have designedC.have been designed D.were designed但是design发生在it is said 之前为什么不用完成时呢?
It is said that the early European playing-cards ______ for entertainment and education.
A.were being designed B.have designed
C.have been designed D.were designed
但是design发生在it is said 之前为什么不用完成时呢?

It is said that the early European playing-cards ______ for entertainment and education.A.were being designed B.have designedC.have been designed D.were designed但是design发生在it is said 之前为什么不用完成时呢?
it is said 是现在时,据说的意思,指现在说的,而在宾语从句中描述的是过去发生的事情,所以用一般过去时,没有完成时的概念.



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