单选题:根据以下材料,回答题。Backpacks are convenient because A.they can be ve

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题目内容:
根据以下材料,回答题。

Backpacks are convenient because
A.they can be very large.
B.they can hold as many things as you want to carry.
C.your hand sare freed to do other things.   
D.you do not have to carry things with you.
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