题目内容
18.Waste paper shouldn't _____ everywhere.It's our duty to keep our classroom clean. ( )A. | be thrown | B. | throw | C. | is thrown |
分析 废纸不应该到处乱扔.我们有责任保持教室内的清洁.
解答 答案A 情态动词被动语态的构成:情态动词+be+过去分词.根据"keep our classroom clean"可知不应该在教室内扔废纸,废纸是throw这个动作的承受者,要用情态动词的被动语态.故选A.
点评 要掌握情态动词被动语态的构成形式,再结合具体的句意,做出正确选择.
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