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题目内容
（国家开放大学-开放英语4）
This growth, ____________________ mainly in Southeast Asia and Africa, has dramatic consequences.
选择一项：
a.
happens
b.
which is happening
c.
which happening
d.
which happened
选择一项：
a.
happens
b.
which is happening
c.
which happening
d.
which happened
参考答案
