问题
选择题
I can never forget the days________we worked together and the days________we spent together. [ ]
A. on which; when
B. which; when
C. what; that
D. when; which
答案
答案：D
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I can never forget the days________we worked together and the days________we spent together. [ ]
A. on which; when
B. which; when
C. what; that
D. when; which
答案：D