问题
选择题
It took a great deal of courage to admit that all his efforts had been________.[ ]
A. in danger
B. in turn
C. in return
D. in vain
答案
答案：D
搜题请搜索小程序“爱下问搜题”
It took a great deal of courage to admit that all his efforts had been________.[ ]
A. in danger
B. in turn
C. in return
D. in vain
答案：D
