改错 it is very cold in December here,but(A)you can still see(B) many brave old men swim(C)
问题描述：
改错 it is very cold in December here,but(A)you can still see(B) many brave old men swim(C)
it is very cold in December here,but(A)you can still see(B) many brave old men swim(C) in the sea if you go Xinghai Park
答
C swim -> swimming
see sb doing sth 看见某人正在做某事.
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