题目内容
5.His sister left home in 2010,and ____ since.( )A. | had not been heard of | B. | has not been heard of | ||
C. | had not heard of | D. | has not heard of |
分析 他的妹妹在2010年离开家,自从那时就没有音讯了.
解答 答案为B.
根据句意可知,sister与hear of之间是被动关系,since后其实要省略了时间点2010,由此可知,要用现在完成时.故选B.
点评 考查现在完成时被动语态,结构是现在完成时态和被动语态结构的叠合,即"have+been+动词过去分词".since的四种用法
1)since+过去一个时间点(如具体的年、月、日期、钟点、1980,last month,half past six).例如:
I have been here since 1989.1989起,我一直在这儿.
2)since+一段时间+ago.例如:
I have been here since five months ago.我在这儿,已经有五个月了.
3)since+从句.例如:Great changes have taken place since you left.你走后,变化可大了.
4)It is+一段时间+since从句.例如:
It is two years since I became a postgraduate student.我考上研究生有两年了
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