Question

（B C）26.They have known each other_____.(复选) A.from last year B.since 1976 C.for many years

D.only a few years ago
为什么是选B、C

Answer 1

主句中时态是现在完成时， have known ， 时间状语要注意了。
现在完成时态的标志词如慧并下：since+时间, for + 时段, already（肯告碧含定）袜笑, yet（否定，疑问）, just, before, recently, recent years, these days/years, still, lately, in the past few years, ever since, in the last five months, up to now, since then, so far, ever, never, yet, twice, once, on several occasion, in the past few days/weeks/months/years, (up to)these few days/weeks/months/years, this morning/week/month/year, up to present, up to now,till now .....
该句中符合的是B.since 1976 C.for many years（Since，，，， 和 for。。。）

Answer 2

句子使敬谈用了现在完成时。能与现在完租伍成时连用的时间状语有since+时间点， for +一段时间，

故选B/C

其余弊稿或两个用于一般过去时