There are thirty students in our class.( )of them are league members.

问题描述:

There are thirty students in our class.( )of them are league members.
A.No one
B.Either
C.All
D.Both

答案是 C.All
第二句动词 are 说明名词是复数,只有选项 C 和 D 是复数名词,
但因 30 students 不能选 both,必须选 all .