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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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。