问题
选择题
It is human nature to think back to a golden age _____ one's country was strong and respected. [ ]
A. if
B. when
C. while
D. after
答案
答案：B
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It is human nature to think back to a golden age _____ one's country was strong and respected. [ ]
A. if
B. when
C. while
D. after
答案：B