题干
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(点此获取答案解析）
B
It is usually warm in my hometown in March, but it ______ be rather cold sometimes.
A：must
B：can
C：should
D：would
和
，样本标准差分别为
和
，则（ ）