问题
选择题
The boss had to go to Beijing on business on March 28, _____ happened to be his only son's birthday. [ ]
A. where
B. when
C. that
D. which
答案
答案：D
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The boss had to go to Beijing on business on March 28, _____ happened to be his only son's birthday. [ ]
A. where
B. when
C. that
D. which
答案：D