It is said that the early European playing-cards for entertainment and education.
A. were designed
B. have designed
C. have been designed
D. were being designed
网友回答
(答案→)A. were designed
B. have designed
C. have been designed
D. were being designed
解析：这个句子中，it是形式主语，后边that引导了一个主语从句，主语从句中主语the early European playing-cards与动词design之间是被动关系，且是发生在过去的事情，故用一般过去时的被动语态，故选A。