题目内容
17.This river ______ up by the cleaners every week.( )| A. | is cleaned | B. | cleans | C. | cleaned |
分析 河每周都由清洁工人清理.
解答 答案:A.结合every week可知表达的是经常性的动作,故用一般现在时,主语this river是clean的承受者,故用一般现在时的被动语态be+过去分词,主语三单,故is,故答案是A.
点评 被动语态由"助动词be+及物动词的过去分词"构成.被动语态的时态变化只改变be的形式,过去分词部分不变.疑问式和否定式的变化也如此.
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