问题
选择题
They _______ go to the cinema very often. [ ]
A. not
B. don't
C. doesn't
D. no
答案
答案：B
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They _______ go to the cinema very often. [ ]
A. not
B. don't
C. doesn't
D. no
答案：B
，则f(x)的可去间断点的个数为______．