题目内容
5．--Tom，you______ go out to play until your homework _______．--OK，Mum．（ ）
| A． | must，finishes | B． | can't，is finished | ||
| C． | can't，hasn't finished | D． | mustn't，finishes |
分析 --汤姆，你直到写完作业才可以出去玩．
--好的，妈妈．
解答 答案：B not…until句型意思是：直到…才…，结合句意第一空是"不能"，应该用can't，mustn't意思是"禁止"；第二空，主语your homework 你的作业是谓语动词finish的承受者，当句子的主语是动作的承受者时，应该用被动语态，根据句意：直到写完作业才可以出去玩，这个动作还没有发生，应该用一般现在时代替将来时，故排除选项C，本题考查的是一般现在时态的被动语态，一般现在时态的被动语态的构成是is/am/are+过去分词．故选B．
点评 本题考查的是情态动词的用法，理解句意并掌握情态动词的用法是解答本题的关键．
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