It is said that the early European playing-cards for entertainment and education
来源：网络
时间：
推荐文章
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
试题答案
D
解析：early暗示该空表示“过去被设计”，应填一般过去时被动语态动词形式were designed。