It is said that the early European playing-cards ______ for entertainment and education

ItissaidthattheearlyEuropeanplaying-cards______forentertainmentandeducation.A.werebei... 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
答案是D 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 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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sb is said to have done =it is said that sb did 是这样么?
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可以这么理解,意思都是据说某人原来做过某事
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