问题描述：
Thanks to the Internet ,different kinds of information ______in a short time.A.can be learned
Thanks to the Internet ,different kinds of information ______in a short time.
A.can be learned B.has been learned
C.can learn D.has learned
请问为什么不能选B呢?
Thanks to the Internet ,different kinds of information ______in a short time.
A.can be learned B.has been learned
C.can learn D.has learned
请问为什么不能选B呢?
问题解答：
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