问题
单项选择题
There have been many（）in their marriage but they still love each other.
A.right and wrong
B.back and forth
C.ups and downs
D.right and left
答案
参考答案：C
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There have been many（）in their marriage but they still love each other.
A.right and wrong
B.back and forth
C.ups and downs
D.right and left
参考答案：C