问题
单项选择题
I need （）more volunteers to help clean the classroom.
A.none
B.any
C.few
D.some
答案
参考答案：D
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I need （）more volunteers to help clean the classroom.
A.none
B.any
C.few
D.some
参考答案：D
在点x=2处的连续性与可导性．