题目内容
(请给出正确答案)
[主观题]
He attempted _______ to set up a company of his own.A. with vainB. on vainC. in vainD.
He attempted _______ to set up a company of his own.
A. with vain
B. on vain
C. in vain
D. of vain
答案
查看答案