It is usually warm in my hometown in March but it be rather cold sometime.A. mustB. canC

问题补充：

It is usually warm in my hometown in March, but it be rather cold sometime.

A. must

B. can

C. should

D. would

答案：

A. must

B. can

C. should

D. would

解析：考察情态动词用法。A一定，必定；B可能；C应该；D会；结合句意可知是表示存在某种可能性，故can正确。句意：通常在我的故乡三月份是很温暖的，但是有时候也有可能相当冷。