题目内容
【题目】Mary was listening to music while she _________ to school.
A. walked B. was walking C. is walking D. walks
【答案】B
【解析】句意：当玛丽在走着去上学的路上，她听着音乐。因为主句的谓语动词 was listening是过去时，所以从句也应该用过去时，while引导时间状语从句的谓语动词要用动词的过去进行时。故选B。
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题目内容
【题目】Mary was listening to music while she _________ to school.
A. walked B. was walking C. is walking D. walks
【答案】B
【解析】句意：当玛丽在走着去上学的路上，她听着音乐。因为主句的谓语动词 was listening是过去时，所以从句也应该用过去时，while引导时间状语从句的谓语动词要用动词的过去进行时。故选B。