问题

sleep l6 to l8 hours in every 24hours, and they sleep less ________ they grow older.
A:while
B:as
C:when
D:after
B:as
C:when
D:after
正确答案是:
同类题型
The room is so dirty, _____ we clean it?—Of course.
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__ was my head teacher, Miss Liu, that read several inspiring stories to encourage me to go on.