题目内容
1．Our classroom ___ every day．We can study comfortably in it．（ ）| A． | cleans | B． | clean | C． | was cleaned | D． | is cleaned |
分析 我们的教室每天都打扫，我们能舒适的在里面学习．
解答 答案：D．结合every day可知表达的是经常性动作，故用一般现在时，主语our classroom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D．
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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