问题
单项选择题
This growth,（）mainly in Southeast Asia and Africa, has dramatic consequences.
A.happens
B.which is happening
C.which happening
D.which happened
答案
参考答案：B
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This growth,（）mainly in Southeast Asia and Africa, has dramatic consequences.
A.happens
B.which is happening
C.which happening
D.which happened
参考答案：B