问题
选择题
—_______ should we clean the library?
—Twice a week. [ ]
A. How many
B. How much
C. How long
D. How often
答案
答案：D
搜题请搜索小程序“爱下问搜题”
—_______ should we clean the library?
—Twice a week. [ ]
A. How many
B. How much
C. How long
D. How often
答案：D