问题描述：
It was at Christmas ____ we bought some games and toys to take to the Children’s Home.
A. when
B. that
C. which
D. on which
A还是B? 为什麽?
哪一个啊.. = =
A. when
B. that
C. which
D. on which
A还是B? 为什麽?
哪一个啊.. = =
问题解答：
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