题目内容
20．There are many trees on sides of the street in our city．（ ）| A． | both | B． | all | C． | every |
分析 在我们城市的街道两边有很多树．
解答 答案：A．both意思是"两者都"后面跟可数名词复数；all意思是"全部都"指的是三者或三者以上都；every意思是"每个"．根据"sides of the street"可知街道的两边都有树，sides是复数形式，所以空格处要用both，故选A•
点评 首先要掌握这几个代词的意思以及用法，然后结合具体的题目，就可以确定正确答案．
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