请问此题的关系代词是用who还是that 1.Xiao Long was the only one___ was born in 1990 in our class .

问题描述:

请问此题的关系代词是用who还是that 1.Xiao Long was the only one___ was born in 1990 in our class .

that
如果先行词被only修饰的话只能用that做关系代词