While mother (put)Cathy to the bed ,the door bell ( )(ring)适当形式填空
问题描述:
While mother (put)Cathy to the bed ,the door bell ( )(ring)适当形式填空
答
不是的 这是一个时间状语从句 put /is ringing
While mother (put)Cathy to the bed ,the door bell ( )(ring)适当形式填空
不是的 这是一个时间状语从句 put /is ringing