题目内容
2．The teenagers _____ to choose their own clothes．（ ）| A． | allow | B． | allowed | ||
| C． | are allowing | D． | should be allowed |
分析 青少年应该被允许自己选择自己的衣服，
解答 答案：D．allow sb to do sth 允许某人做某事，主语the teenagers是allow的承受者，故用被动语态be+过去分词，结合句意用should表示应该，故用情态动词的被动语态---情态动词的被动语态---情态动词+be+过去分词，故选D．
点评 情态动词的被动语态---情态动词+be+过去分词的呈现，各种类型的被动语态的构成要理解掌握．
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