The children have to go to bed ( ) 10:00A.in B.by.C.but

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The children have to go to bed ( ) 10:00A.in B.by.C.but
The children have to go to bed ( ) 10:00
A.in B.by.C.but

The children have to go to bed ( ) 10:00A.in B.by.C.but
选B,意为截止到十点