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 查看更多

 

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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

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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

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