koalas sleep 20 hours ( )day. 1.a 2.an 3./

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koalassleep20hours()day.1.a2.an3./koalassleep20hours()day.1.a2.an3./koalassleep20hours()day.1.a2.an3

koalas sleep 20 hours ( )day. 1.a 2.an 3./
koalas sleep 20 hours ( )day. 1.a 2.an 3./

koalas sleep 20 hours ( )day. 1.a 2.an 3./
选A 如果不是选择题,还可以写every