题目内容
14.We have known each other ________ three years ago.( )| A. | before | B. | since | C. | for | D. | in |
分析 自从三年以前,我们就彼此认识了.
解答 答案:B 根据前文We have known each other 我们已经彼此认识,为现在完成时;后文three years ago三年以前,故用介词since自从,它可以接"一段时间+ago",故答案是B.A在…之前,C为了,D在里面.
点评 since作介词,后面可以接一个时间点,如since 1980,也可以接"一段时间+ago",如:since three years ago,since two months ago等.
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