The earthquake broke out on a day

The earthquake broke out on a day _______ my father left for America, a day _______I’ll never forget.

that; when

when; when

that; which

when; that

答案及解析：本题考查定语从句D选项，第一个空先行词为day，空格在从句作时间状语，故选when引导后面的定语从句；第二个空先行词为day，空格在从句中作forget的宾语，故用that引导定语从句。综上，D选项正确A选项，与题意不符，故排除。B选项，与题意不符，故排除。C选项，与题意不符，故排除。故正确答案为D项。