He usually sleeps () 12 hours a day.A.on B.at C.for

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Heusuallysleeps()12hoursaday.A.onB.atC.forHeusuallysleeps()12hoursaday.A.onB.atC.forHeusuallysleeps(

He usually sleeps () 12 hours a day.A.on B.at C.for
He usually sleeps () 12 hours a day.
A.on B.at C.for

He usually sleeps () 12 hours a day.A.on B.at C.for
选C
表示延续一段时间,选用for
for a long time
for a minute
等等

C

C 一段时间是for

C

C