To help people learn more about Chinese history and culture, Nanjing Museum ____ to the public for free since 2008.

A. has opened
B. has been open
C. was opened
D. was open

正确答案：B

这种题目是初中特别喜欢考察的语法题。因为综合考察点够多。

1. since 这个时间标志词。
2. 现在完成时和一般过去时的区别。
3. 延续动词和非延续动词的区别和转化。

也正是因为考察的点多，因此坑也多。

有家长会觉得好像没有正确选项，怎么没有 has been opened 的选项。

since 这个词的意思是“自从……”，暗含着一直持续到现在。一般要与“现在完成时”或“过去完成时”连用。

而 open 动词本身是个瞬间性的动词（非延续性动词），发生即完成，不可能从 2008 年开始一直在宣告对外免费开放。

而是博物馆在 2008 年宣告对外免费开放之后，一直处于对外免费开放的状态。因此要把非延续的 be opened 变成延续的 be open。加上完成时就是 has been open，这里的 open 是形容词，开放的。

如果选择 A has opened，那就表示南京博物馆自己从 2008 年以来就在宣告对外开放。

如果选择 C was opened，那么应该是：Nanjing Museum was opened to the public for free in 2008. 单纯描述在 2008 年免费对外开放这件事。

如果选择 D was open，Nanjing Museum was open to the public for free，则表示之前对外免费开放过，暗含现在不对外免费开放了。

看着是考察时态，但不光是考察时态，也不只是时态。脱离动词本身只看时态是没有意义的。

有关这方面，可以看看陈用仪老师对动词的讲解：https://t.cn/A6YDMb0O

#语法也可以很简单#

Sergio Jr turns 10 today… and that reminds us that today marks 10 years since we embarked on the most beautiful adventure of our lives. An adventure that has given us joy, hopes and millions of other reasons to enjoy life. The smile of the family, the best big brother for your siblings. We love you madly. ¡Feliz cumpleaños, Nano!
Happy birthday, Nano. We love you to the moon and back.

#考研英语长难句打卡# 每日一句，搞定长难句，英语拿高分！

【Day-20】Economists have been particularly surprised by favorable inflation figures in Britain and the United States,since conventional measures suggest that both economies,and especially America's,have little productive slack.