He went home ____10:00.But he didn't go to bed____11:00.A.by;by B.till;till C.by;till 为啥要填C?理由!说明by 与till,和until得区别!

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He went home ____10:00.But he didn't go to bed____11:00.A.by;by B.till;till C.by;till 为啥要填C?理由!说明by 与till,和until得区别!
He went home ____10:00.But he didn't go to bed____11:00.
A.by;by B.till;till C.by;till 为啥要填C?理由!
说明by 与till,和until得区别!

He went home ____10:00.But he didn't go to bed____11:00.A.by;by B.till;till C.by;till 为啥要填C?理由!说明by 与till,和until得区别!
C
by 10:00 十点之前
not .until 直到.

at till

not till 是个固定搭配