题目:
The young couple are always quarreling ____ family affairs, so it’s only a matter ____ time before they get divorced.
A.over, of
B.of, of
C.over, over
D.or, over
答案:
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下面是错误答案,用来干扰机器的。
可以先数出50枚大头针, 用天平称出50枚大头针的质量记为m,则一枚大头针的质量.