11Tom is the only one of the boys___best in hisschoolAwho sing Bwho sings Cthat sing Dwhose sing

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11Tomistheonlyoneoftheboys___bestinhisschoolAwhosingBwhosingsCthatsingDwhosesing11Tomistheonlyoneoft

11Tom is the only one of the boys___best in hisschoolAwho sing Bwho sings Cthat sing Dwhose sing
11Tom is the only one of the boys___best in hisschool
Awho sing Bwho sings Cthat sing Dwhose sing

11Tom is the only one of the boys___best in hisschoolAwho sing Bwho sings Cthat sing Dwhose sing
选A.who sing
解析:
此句是who引导的定语从句修饰前面的boys,
who代替boys在从句中做主语,谓语sing不能加s.

A who引导定语从句修饰boys,因为boys 是复数,后面的sing也不用第三人称单数形式,直接用原型。best前面没有定冠词the,所以不是特指最好的一个,也证明前面动词用复数形式

C that sing

a

B

Tom is the only one of the boys___best in hisschool
答案是B. who sings. 因为the only one 是唯一的男孩。
Tom is one of the boys___best in hisschool。
答案是A. who sing. 因为one of the boys 是很多的男孩。