Question

【题目】What was Tom doing ________ his father was looking for him?

A. while B. since C. after D. until

Answer 1

【答案】A

【解析】句意：当他爸爸在找他的时候，汤姆在做什么？A. while 当---时候； B. since自从； C. after 在---以后； D. until直到；根据What was Tom doing和his father was looking for him?

之间同时进行；故选A