题目内容
15．-Excuse me，sir，smoking _________ in the gas station．-Oh，I'm really sorry．（ ）
| A． | doesn't allow | B． | isn't allowed | C． | aren't allowed | D． | wasn't allowed |
分析 --对不起，先生，在加油站不允许吸烟．
--哦，我真的很抱歉．
解答 答案：B
根据答语Oh，I'm really sorry．"哦，我真的很抱歉"．可知上文应该是说："在加油站不允许吸烟"．又知加油站不允许吸烟是生活常识可知用一般现在时来表达，故该空用一般现在时，再根据主语smoking是谓语动词allow 的承受者，二者是被动关系，故用被动语态且表达否定意思，所以空处用一般现在时的被动语态的否定形式，其构成为：am not/isn't/aren't+及物动词的过去分词，根据smoking是动名词做主语用单数，故填isn't allowed．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的否定形式．一定注意其构成形式，其结构为：am not/isn't/aren't+及物动词的过去分词
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