____was a time ____black people were looked down uponA it,when B there ,that C it,that D this ,that 为什么选A
问题描述:
____was a time ____black people were looked down upon
A it,when B there ,that C it,that D this ,that 为什么选A
答
后面是定语从句,time做时间状语,用when引导