Millie’s father was sleeping he was watching TV.A. asB. whenC. whileD. after

问题补充：

Millie’s father was sleeping he was watching TV.

A. as

B. when

C. while

D. after

答案：

A. as

B. when

(答案→)C. while

D. after

解析：as作为，随着；when当……时；while当……时；after在……之后。当米莉正在看电视时，他的父亲正在睡觉。While引导时间状语从句时，强调主从动作的同时发生，经常主从都为进行时态，故选C。