问题描述:
The boys ( ).That is why their hair is wet A.have been swimming B.have swum
C.have been swum
D.swim
答案是选A为什么不选C或B呢?
The boys ___________ just now.That is why thier hair is wet.
A.have been swimming
B.have swum
求详解
C.have been swum
D.swim
答案是选A为什么不选C或B呢?
The boys ___________ just now.That is why thier hair is wet.
A.have been swimming
B.have swum
求详解
问题解答:
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