Then moment Mary will always remember is Mr．Black gave her a lot of valuable advice on how to improve her writing．
A. when; that
B. that; that
C. that; when
D. when; where
网友回答
A. when; that
B. that; that
(答案→)C. that; when
D. when; where
解析：
试题分析:句意：玛丽将一直记住的时刻是布莱克先生关于如何提高写作水平而给了她很多宝贵建议的时候。从结构可知第一个空后是定语从句，从句中缺少remember的宾语，用关系代词，排除AD选项；第二个空后是表语从句，从句主干完整，故用连接副词，答案选C。