When it is-------7 o'clock,he begins to go home.A.near B/ C.about D.at
问题描述：
When it is-------7 o'clock,he begins to go home.A.near B/ C.about D.at
怎么选,为什么?
答
B当7点钟的时候他开始回家about 和at 为什么都不能用？
when it is 7 o'clock相当at 7 o'clock
如果加上about at 重复了