题目内容
9．As everyone knows，rubbish _______ everywhere．（ ）| A． | need be thrown | B． | mustn't be thrown | ||
| C． | can't throw | D． | may throw |
分析 句意：众所周知，垃圾不可以到处乱扔．
解答 答案：B．根据rubbish _______ everywhere的结构并结合语境及选项可知，众所周知垃圾不可以到处乱扔，在这里rubbish是动作throw的承受者，所以本句应该用被动语态，Mustn't表禁止，在这里考查了含有情态动词的被动语态，构成是：情态动词+be+动词过去分词．故选B．
点评 解答本题的关键是注意含有情态动词的被动语态的用法以及构成．
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