【題目】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:當瑪麗在走著去上學的路上,她聽著音樂。因為主句的謂語動詞 was listening是過去時,所以從句也應(yīng)該用過去時,while引導時間狀語從句的謂語動詞要用動詞的過去進行時。故選B

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