英语有关时间状语从句的问题原题重现：My mother was worried because my little si

英语有关时间状语从句的问题
原题重现：My mother was worried because my little sister was ill,especially _______father was away.
A.as B.that C.if D.during
我开始选的D,后一看解析错了,应为A,解析给的是during后不接从句,我明白了,但是可不可以这样说during the time father was away,呢,那么是不是我这样说的话father was away做定从了呢,那不是应还要加个when作连接词啊