Lucy and I are classmates.We _____ in Class One.A.all are B.are all C.both are D.are both
问题描述：
Lucy and I are classmates.We _____ in Class One.A.all are B.are all C.both are D.are both
答
选D
all 用于多个人,≥3个人
both 仅用于两个人.lucy和 I只有两个人.
其次,both做“都”讲,是副词,副词放在be动词之后,即BOTH要跟在ARE后面