问题
选择题
It was a rare occasion________my badtempered father reacted calmly to such a situation. [ ]
A. who
B. which
C. why
D. when
答案
答案：D
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It was a rare occasion________my badtempered father reacted calmly to such a situation. [ ]
A. who
B. which
C. why
D. when
答案：D