问题
选择题
What do you think we should ______ improve our environment? [ ]
A. do
B. to
C. do for
D. do to
答案
答案：D
搜题请搜索小程序“爱下问搜题”
What do you think we should ______ improve our environment? [ ]
A. do
B. to
C. do for
D. do to
答案：D