Question

英语完形填空we send our children to school to prepare them for the time ___ hey will have to work

we send our children to school to prepare them for the time ___ hey will have to work ___ themselves.
1.A that B when C while D as
2.A for B on C with D to
分别选什么？ 为什么？这句话怎么理解啊？？？、

Answer 1

你打漏了一个t吧，we send our children to school to prepare them for the time __B_(t)hey will have to work __B_ themselves.
句意，我们把我们的娃儿送去学校为其今后得靠自己过活的时候做准备。
首先第一个空是个定语从句，先行词是time，还原到从句(t)hey will have to work __B_ themselves中做时间状语（他们将（在那个时候）靠自己过活）.，选表时间的连词，所以是when。
第二个空是词组 on oneself ，依靠某人。