We can never forget the days _______ the two astronauts in spaceship worked together and the days ________ we spent together.A.when; whichB.which; whenC.what; thatD.on which; when
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A解析选择定语从句的关系词关键在于区别关系词在从句中作什么成分。第一个先行词the days在从句中作状语，故用when或on which；而第二个the days在从句中作spent的宾语必须用which或that。综合两个空，只能选A。