Question

【题目】The boy ______ down by a truck when he was running across the road.

A. is knocked B. was knocked C. will be knocked D. has been knocked

Answer 1

【答案】B

【解析】句意：那个男孩在过马路的时候，他被一辆大卡车撞了。根据when后用的时态是过去时范围之内的，所以主句也应该用过去时，故排除ACD，选项AD属于现在时，选项C属于将来时， boy与knock down之间是被动关系，故选B。