It's hot in summer here ,( A ) it is not cold in winter .A.but B.and C.so D.for

问题描述:

It's hot in summer here ,( A ) it is not cold in winter .A.but B.and C.so D.for
2.only后跟动词原形吗?不用三单?

选A
是的 前后有关转折关系 所以用but