the weather in the south in summer is usually very hot but it———— be cold sometimes

问题描述:

the weather in the south in summer is usually very hot but it———— be cold sometimes
The weather in the south in summer is usually very hot but it———— be cold sometimes.
A.should B.can C.must D.may
填什么?

The weather in the south in summer is usually very hot but it can be cold sometimes.