问题
We can never forget the days _______ the three astronauts in spaceship worked together and the days ________ we spent together [ ]
A: what; that
B: which; when
C: when; which
D: on which; when
B: which; when
C: when; which
D: on which; when
正确答案是：
同类题型
The first day of school, my teacher says “I” ____a word in English.
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