问题描述：
I got up very late this morning because I didn't go to bed () I finished () the work at 12 last night.
A.when,to do b.when ,doing
c.till,to do
d.till,doing
还要说原因
A.when,to do b.when ,doing
c.till,to do
d.till,doing
还要说原因
问题解答：
我来补答展开全文阅读