Our maths teacher（ ）the post office when I （ ）him.

Our maths teacher（ ）the post office when I （ ）him.
要详细的说明,越多越准确越好!
A was passing ---- saw
B passed --- was seeing
C passed ---- had seen
Dwas passing----was seeing

选A.句意：当我看见我们的数学老师时他正经过邮局.本题考查时态,第一个空是过去进行时,进行时表示的过去的某一具体时间正在做某事.如果题目中提示具体时间,比如在昨天的八点他正经过邮局,这时用过去进行时.这道题的具体时间由when引导的时间状语从句充当,表示在我看见他的那个具体时间点他正在做什么事.再比如,he was doing his homework when i came into his room.

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