问题
选择题
_____ a solution to the problem of water shortage, we have to put all our efforts together. [ ]
A. To work out
B. Working out
C. Work out
D. Being worked out
答案
答案：A
搜题请搜索小程序“爱下问搜题”
_____ a solution to the problem of water shortage, we have to put all our efforts together. [ ]
A. To work out
B. Working out
C. Work out
D. Being worked out
答案：A