题文
The police tried _________ to break up the protest crowds.
| A．in vain | B．on vain |
| C．at vain | D．with vain |
推荐试卷
The police tried _________ to break up the protest crowds.
| A．in vain | B．on vain |
| C．at vain | D．with vain |
试题篮
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