瑞星卡卡安全论坛综合娱乐区Rising茶馆 一道选择题!急啊!!!!!!

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一道选择题!急啊!!!!!!

一道选择题!急啊!!!!!!

Being fit helps you to stay alert and ______your lessons.
A.focused on B.focusing on C.was focused on D.focuses on


到底是B还是D?
最后编辑2007-03-25 21:16:48
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gototop
 

可惜啊,答案应该是A,课文中的原话

But,I don't know why.
gototop
 
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