题目内容
4．Trees ________ every year to make our city greener．（ ）| A． | plant | B． | are planted | C． | were planted | D． | will be planted |
分析 每年种植树来我们的城市环境更绿．
解答 答案：B 本题目中的trees和动词plant之间是被动关系，树应该是被载．有根据every year-每一年，表明是一般现在时，所以是一般现在时的被动语态，结构是：be（am，is，are）+过去分词．故选B
点评 先分析出本题目要用被动语态，然后结合被动语态的结构以及时态选择答案．
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