Every means has been . No one is effective. A．trying out B．tried out C．trying in
来源：网络
时间：
推荐文章
Every means has been _______. No one is effective.
A．trying out B．tried out C．trying in D．tried on
试题答案
B
Every means has been _______. No one is effective.
A．trying out B．tried out C．trying in D．tried on
B