the boy to school he was nine years old .的地方填什么a went,until b didn`t,until
问题描述：
the boy to school he was nine years old .的地方填什么a went,until b didn`t,until
cwon`t,until d didn`t go,until
答
d didn`t go,until
the boy didn't go to school until he was nine years old .
男孩直到9岁才上学.
考察的是
not .until.
直到.才.