1 C 我们已经参观完图书馆了,所以用完成时（被带领参观）
2 D 同上,但我们是带别人参观,所以用主动形式
3 B 强调“看到”这个瞬间动作,其他选项不符合语义
4 A 同上
1.__around the library ,we were taken to see the lab.
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