this is the only person __i know in beijing .A who B that
问题描述：
this is the only person __i know in beijing .A who B that
Joe wasn't the only person__got sick during the spread of the disease.A that B who
我们的答案是B 怎么回事？
答
选 B这里的先行词是person,是人,本来可以用who引导从句的,但先行词之前有修饰词only,这种情况就只能用that.PS：当先行词有some,any,no,somebody,anybody,nobody,something,anything,everything或nothing修饰时,只用t...