—I can never forget the day ___ we spent together in the summer camp．—Well, especially the day _______it suddenly began to rain in the middle of the night．A.when; whenB.which; whenC.what; thatD.on which; when
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B解析考查定语从句。本题两空都引导定语从句，第一空的连词在从句中做spend的宾语，用that/which；第二空的连词在从句中做状语，用when。