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
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
问题解答：
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