The archaeologists found gold coins and pottery in the lowest level of the site they reached three months ago．
A. what
B. for which
C. that
D. to which
网友回答
A. what
B. for which
(答案→)C. that
D. to which
解析：考查定语从句的关系词。先行词是the site，在定语从句 they reached three months ago．中作宾语，所以用that引导。选C。