问题补充:
. It is usually warm in my hometown in March, but it be rather cold sometimes.
A. must
B. can
C. should
D. would
答案:
A. must
(答案→)B. can
C. should
D. would
解析:can表示推测时通常只用于否定句或疑问句,很少用于肯定句。但有两种情况是例外(即可用于肯定句):一是表示纯理论上的可能性,二是表示“有时”,如:Even experienced teachers can make mistakes. 即使是有经验的教师也可能出错。She can be very unpleasant. 她有时很令人讨厌。