Question

【题目】It _______ heavily ________ I left school yesterday.

A. was snowing; when B. was snowing; while C. snowed; when D. is snowy; as

Answer 1

【答案】A

【解析】句意：昨天我离开学校的时候，正下着大雪。根据yesterday可知此处用一般过去时，when引导的从句用一般过去时，谓语用瞬间性动词，主句用过去进行时。while引导的时间状语从句，用延续性动词，leave是瞬间性动词，故选A。