题干
—Do you have any plans for this Sunday?
—I'm not sure. I go to the countryside to see my grandmother.
A：can
B：must
C：may
D：need
答案(点此获取答案解析）
C
—Do you have any plans for this Sunday?
—I'm not sure. I go to the countryside to see my grandmother.
A：can
B：must
C：may
D：need
胶头滴管，常用于混合物质分离的是（ ）