We were swimming in the lake suddenly the storm started． [ ] A． when B． while C．

We were swimming in the lake ________ suddenly the storm started．

when

while

until

before

试题答案

答案：A

本题考查引导时间状语从句的从属连词。when表示“这时”，while表示“正当；在……期间”，until表示“直到……时候”，before表示“在……之前”。这句话要表达的是“我们在湖里游泳，就在这时，暴风雨开始了”。