问题补充：
We were deeply impressed by the schools and teachers we had visited there.
A. where
B. which
C. that
D. who
答案：
A. where
B. which
(答案→)C. that
D. who
解析：
这题考查定语从句的用法：先行词是：the schools and teachers，当先行词有人有物时，应该用that引导定语从句。句意是：我们对在那里见到的学校和老师印象深刻。选C。
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