【題目】One day， when Ben with Sam in the street， a motorcycle came towards Ben and knocked him down.

A.is walkingB.walkedC.was walkingD.had walked

【答案】C

【解析】

句意：一天，本和薩姆在街上散步時(shí)，一輛摩托車朝本駛來(lái)，把他撞倒了。

A. is walking散步，現(xiàn)在進(jìn)行時(shí)；B. walked散步，過(guò)去式；C. was walking正在散步，過(guò)去進(jìn)行時(shí)；D. had walked已經(jīng)散步，過(guò)去完成時(shí)。when引導(dǎo)的時(shí)間狀語(yǔ)從句，主從句時(shí)態(tài)要一致，主句用一般過(guò)去時(shí)，從句用過(guò)去進(jìn)行時(shí)，這里用過(guò)去進(jìn)行時(shí)，其結(jié)構(gòu)是be doing的形式。根據(jù)題意，故選C。

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