题目内容
12．You are too late．The film ______ since half an hour ago．（ ）| A． | has begun | B． | has been on | C． | began |
分析 你来得太晚了．电影已经开始半个小时了．
解答 答案：B 联系汉语意思根据since half an hour ago（从半小时前），可知此处since是现在完成时的标志词，此处应使用have+过去分词的结构；又因为since短语表示一段时间，所以其所在句子的谓语动词应使用延续性动词．又知has begun意为已经开始，但不能与一段时间连用；have been on意为已经开始，表示一种状态，可以与时间段连用；began是过去时态，显然不符合用法．所以此处应填写has been on，故选B．
点评 此题考查现在完成时的用法．做题时，应抓住句中的时间标志词判断出时态，可得出句子结构．其次要注意当句中是for+一段时间/since+时间点时，要使用延续性动词．
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