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Attempts to persuade her to stay after she felt insulted wer

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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?
Attempts to persuade her to stay after she felt insulted wer
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

希望对你有帮助
再问: of+名词 是形容词的意思是吧 of importance是重要的? 是of后面直接接名词单数就行么 还是要看名词的属性(可数不可数)然后加不加s?
再答: be of + 名词 = be + 形容词,如: be of avail === be available; be of importance === be important 一般跟不可数名词,如:height, length, weight, importance等 希望对你有启发。如对你有帮助,请记得及时采纳