16. Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendents, popular known as killer bees had migrated as far north as Southern Texas. A. Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, B. In less than 35 years since releasing African honeybees outside Sao Paulo, Brazil, C. In less than the 35 years since African honeybees had been released outside Sao Paulo, Brazil, D. It took less than 35 years from the release of African honeybees outside Sao Paulo, Brazil, when E. It took less than 35 years after the time that African honeybees were released outside Sao Paulo, Brazil, and then BC中In...since结构错,B中since doing 错,D中It....,WHEN,改变原意和结构,错,E,the time when.. PSONGMAN中关于SINCE的叙述:Use since to say that something started at a point in time in the past, and is still continuing : He has been living in Leeds since 1998. | We've known about it since May. Since is usually followed by a time expression ('last year', 'this morning', '4 o'clock' etc) or by the simple past tense. Use the present perfect or the past perfect in the other clause : I have loved movies since I first went to the cinema. |He had been seriously ill since Christmas. !! Speakers of British English usually say it is a long time/two weeks etc since ..., and speakers of American English it has been a long time/two weeks etc since ..., but both uses are correct : It's weeks (BrE)/It's been weeks (AmE) since I saw Grandma.
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)。 I have been here since 1989. 2) since +一段时间+ ago I have been here since five months ago.
3) since +从句 Great changes have taken place since you left. Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句 It is two years since I became a postgraduate student.
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