it was at five o'clock______he went homeA.when B.that C.since D.before为什么选B,不选Ait was in the office _______ he worksA.that B.which C.as D.where为什么选D,不选A
问题描述：
it was at five o'clock______he went home
A.when B.that C.since D.before
为什么选B,不选A
it was in the office _______ he works
A.that B.which C.as D.where
为什么选D,不选A
答
it is/was …that 是强调句 ,如果选A,则去掉at