题目内容
16．-Mom，my classmates are playing outside．Can I join them？-Not until your homework ．（ ）
| A． | finishes | B． | is finished | C． | finished | D． | was finished |
分析 --妈妈，我的同学们都在外面玩耍，我能加入到他们中去吗？--作业完成才可以．
解答 答案：B
根据上文my classmates are playing outside．Can I join them？询问的现在情况，可知用一般现在时来回答，故该空用一般现在时，再根据主语homework是谓语动词finish 的承受者，二者是被动关系，故用被动语态，所以空处用一般现在时的被动语态，一般现在时的被动语态的构成：am/is/are+及物动词的过去分词，homework为不可数名词，故用is．故选B
点评 做关于被动语态的题时，首先判断主语与谓语动词的关系，其次根据时间词或上下文判断时态，然后二者结合套用结构，本题考查的是一般现在时态的被动语态．一定注意其构成形式，其结构为：am/is/are+及物动词的过去分词
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