After a day's exhausting climb we arrived at we had been told was Garden in the Air.
A. what
B. which
C. that
D. where
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(答案→)A. what
B. which
C. that
D. where
解析：答案：A 考查名词性从句。句意为：经过一天筋疲力尽的攀爬，我们终于到了那个被称为“空中花园”的地方。分析句子结构可知，at为介词，后面是一个宾语从句，we had been told为插入语，宾语从句中缺主语，故用what。故答案选A。