I got home they were having dinner.A. as soon asB. whileC. becauseD. after

问题补充：

I got home they were having dinner.

A. as soon as

B. while

C. because

D. after

答案：

A. as soon as

(答案→)B. while

C. because

D. after

解析：考查时间状语从句。as soon as“一......就”；while“当，而”；because“因为”；after“在......之后”。句意“当我到家时，他们正在吃晚饭。”故选B。