John's parents work in the hospital,they( ) doctors A.all are B.are all C.are both D.both are
问题描述：
John's parents work in the hospital,they( ) doctors A.all are B.are all C.are both D.both are
答
选C
两者的”都“ 要用both
而且both,all 要放在be动词之后,实义动词之前
John 的父母在医院工作,他们都是医生.