Question

The old man has two sons，________is a soldier. A．one of whom B．both of them C．all of whom

The old man has two sons，________is a soldier. A．one of whom B．both of them C．all of whom D．both of whom

Answer 1

A

试题分析：考查定语从句。那个老人有俩个儿子，都是医生。 根据前句two，是两者，而all是三者或三者以上，排除C， 根据谓语动词是is，B和C都是both，做主语谓语动词是复数，再有B中them也不对，需要有连词，排除B和C，根据谓语动词is单数，所以主语必须是单数，所以A正确