Kids of the schools ________ because of the heavy rain.
A.are keeping playing outside
B.were kept from playing outside
C.were kept to play outside
D.were keeping playing outside
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B解析解析：本题考查的是“keep sb．from doing sth．”结构，意为“阻止某人干某事”。keep后无宾语，宾语被提前，所以用被动语态。故正确