Attempts to persuade her to stay after she felt insulted were_____A.of no avail B.no availAttempts to persuade her to stay after she felt insulted were_____A.of no avail B.no avail选什么?为什么?

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Attempts to persuade her to stay after she felt insulted were_____A.of no avail B.no avail
Attempts to persuade her to stay after she felt insulted were_____
A.of no avail B.no avail
选什么?为什么?

A
be of avail:有用的,这里avail是名词,所以要用of连接,再如:of some importance:重要的

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