题目内容
句型转换
完成句子，使改写后的句子完整，并与原句的意思相符，每个空格只准填一个单词．
People in the US can’t drink beer or wine before they reach 21．
People younger than 21 ________ ________ ________ ________ drink beer or wine．
答案：are,not,allowed,to
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