问题
单项选择题
Our business has been slack （） three months.
A. in
B. within
C. over
D. for
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
Our business has been slack （） three months.
A. in
B. within
C. over
D. for
参考答案：D