题目内容
（请给出正确答案）
提问人：网友d*******1
发布时间：2022年3月26日 10:51
[单项选择题]
Electric Backpack Backpacks (背包) are convenient. They can hold your books, your lunch, and ...Backpacks are convenient because()
A.they can be very large.
B. they can hold as many things as you want to carry.
C. your handsare freed to do other things.
D. you do not have to carry things with you.
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