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The doctor told me to take the medicine     .
A.every fourth hours
B.each fourth hour
C.each four hours
D.every four hours
D

试题分析:句意:医生告诉我要每四个小时吃一次药。表示每几个小时,every +基数词+复数名词;或every+序数词+单数名词。故选D。
点评:本题难度适中。固定短语主要考查它们的意义及用法,但是它们是在一定的语言环境下而出现的,所以考生必须能正确理解句子的句意。
即学即练:The trains to New York run     .
A. every second hours
B. each second hour
C. each two hours
D. every two hours
解析:D。句意:到纽约的列车每两小时有一班。
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