问题
We all know laws to discourage the use of plastic bags _______ in many parts of the world
A:passed
B:have passed
C:had been passed
D:have been passed
B:have passed
C:had been passed
D:have been passed
正确答案是：
同类题型
I find _____ not easy to answer this question in English.
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lan enjoy seeing his old friendsyesterday—Yes, he did. He hisold friends for a long time.