问答题

For the past two years, ______ (我一直忙着准备考试).

【参考答案】

I have been busy preparing for the examination

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单项选择题
A. 13.B. 17.C. 30.D. 15.

A. 13.
B. 17.
C. 30.
D. 15.
问答题
According to the US National Heart, Lung and Blood Institute, the reason why older mothers’ children tend to be obese remains （） .
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