he got ready to leave home his parents came to his home.A. WhileB. AsC. UntilD. If

问题补充：

he got ready to leave home, his parents came to his home.

A. While

B. As

C. Until

D. If

答案：

A. While

(答案→)B. As

C. Until

D. If

解析：句意:正当他打算离开家时，他的父母来到了他的家。while 当…时候，引导时间状语从句；as 当…时候，表示两个动作同时发生；until 直到…时候；if 如果，引导条件状语从句。根据句意可知选B。