Mary and Jenny work hard at their lessons and ____of them are often praised by their teachers
问题描述：
Mary and Jenny work hard at their lessons and ____of them are often praised by their teachers
a two b the two c the twos d neither
答
应该是both
这里就选b the two他们两人为什么要加the 是特指吗the 具体指出是这两个人