She down her book and in bed.A. laid; layB. lay; laidC. laid; laidD. lay; lay

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(答案→)A. laid; lay
B. lay; laid
C. laid; laid
D. lay; lay
解析：考查lay的用法。句意“她放下书，躺到了床上。”lie“躺，位于”，过去式是lay；lay“放置”，过去式是laid。故选A。