We can never forget the days the two astronauts in spaceship worked together and the days we spent together.
A. which; when
B. when; which
C. what; that
D. on which; when
网友回答
A. which; when
(答案→)B. when; which
C. what; that
D. on which; when
解析：句意：我们永远不会忘记在宇宙飞船中的两名宇航员一起工作的情形，也永远不会忘记我们在一起的日子。选择定语从句的关系词关键在于看关系词在从句中作什么成分。第一个空，关系词在从句中作时间状语，故用when或on which； 而第二个空，关系词在从句中作spent的宾语必须用which或that。综合两个空，只能选B。