问题
选择题
Occasions are quite rare _____ the father has the time to spend a day with his kids. [ ]
A. when
B. which
C. why
D. that
答案
答案：A
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Occasions are quite rare _____ the father has the time to spend a day with his kids. [ ]
A. when
B. which
C. why
D. that
答案：A