问题描述：
The students are studying hard,for they know_____
A.what they are stuying for B,why they are studying for
上面那个for they know的fpr应该怎么讲?应该选什么?
A.what they are stuying for B,why they are studying for
上面那个for they know的fpr应该怎么讲?应该选什么?
问题解答：
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