题目内容
He tried to invite some famous pop stars to sing in the concert ______, but failed.
| A.with free | B.for freely | C.with freedom | D.for free |
D
考查词组:for free免费,句意:他想邀请一些著名的流行歌星在音乐会免费唱歌,但失败了。选D。
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