It is usually not quite cold in this area in March but sometimes temperature be very low.

问题补充：

It is usually not quite cold in this area in March, but sometimes temperature be very low.

A. should

B. can

C. must

D. shall

答案：

A. should

(答案→)B. can

C. must

D. shall

解析：本题考查情态动词不同含义的辨析。而题干中要求为“有时温度可能会很低”。只有can可以表示“可能”。