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Second,checkyourlifestyle:Donotdrinktea,coffee,colaorchocolatefourhoursbefore.Drinklessliquidsothatyoucanhavenoorfewervisitstothetoilet.A、sleeping B、goingtosleep C、goingtobed D

题目详情
Second, check your lifestyle: Do not drink tea, coffee, cola or chocolate four hours before ____ . Drink less liquid so that you can have no or fewer visits to the toilet. A、 sleeping  B、 going to sleep  C、 going to bed  D、 falling asleep 
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答案和解析
a,before是介词,后面接动词ing形式,所以排除bc,fall asleep是一个形容词,入睡的,所以首选a