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They have leading experts in this field,and that's __________ they've made important progress.

A.whereB.why

C.whetherD.who

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请认真阅读下列短文,并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。注意:每个空格只填1个单词。请将答案写在答题卡上相应题号的横线上。

Research shows that the summer before college can be a dangerous time for teenagers, as they are between home and high school on the one side, and a more challenging and independent existence as a college student on the other.

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7.

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