问题描述：
can see people _____ paper on windows of the shops.
We can see people _____ paper on windows of the shops.
A.put B.are putting C.puts D.to put
为什么是选A不是选B?
We can see people _____ paper on windows of the shops.
A.put B.are putting C.puts D.to put
为什么是选A不是选B?
问题解答：
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