__you read a book half an hour__A.Did;ago B.Were;before C.Did;before D.Were;ago

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__youreadabookhalfanhour__A.Did;agoB.Were;beforeC.Did;beforeD.Were;ago__youreadabookhalfanhour__A.Di

__you read a book half an hour__A.Did;ago B.Were;before C.Did;before D.Were;ago
__you read a book half an hour__
A.Did;ago B.Were;before C.Did;before D.Were;ago

__you read a book half an hour__A.Did;ago B.Were;before C.Did;before D.Were;ago
A,read是动词,得用助动词,而before+时间,时间+ago

选A,一般过去式