中国石油大学 / 中石油
正确率:100%
39. the united nations, which ______ in 1945, is playing a more and more important part in international affairs.
A、was set up
B、set up
C、had set up
D、had been set up
A、was set up
B、set up
C、had set up
D、had been set up
参考答案:
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