The four years, from 1860 to 1864 ___ Lincoln spent fighting for freedom of the slaves is the time ___ the American people will never forget.A.when; whenB.which ; thatC.when; whichD.which; when
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B解析第一空填一个关系代词which, 在定语从句中作spent的宾语;第二空所填的that在定语从句中作forget的宾语.