they eat ____12 hours ______day.A.of;aB.for;aC.in;a为什么?

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they eat ____12 hours ______day.A.of;aB.for;aC.in;a为什么?
they eat ____12 hours ______day.
A.of;a
B.for;a
C.in;a
为什么?

they eat ____12 hours ______day.A.of;aB.for;aC.in;a为什么?
他们一天有12个小时在吃饭. for后面加时间段