The moment ________ Leo will never forget is________ Mr. Smith gave him a lot of valuable advice on how to improve his writing.
A.that; when
B.that; that
C.when; that
D.when; /
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A解析考查从句辨析。第一格是定语从句，先行词在定语从句中做宾语，故用关系代词that；第二格是表语从句，由于主语是the moment，所以应用when引导表语从句。