单选题_____AwhetherBwhichCwhyDwhen
单选题
_____
A
whether
B
which
C
why
D
when
参考解析
解析：
根据explain及下文，可知时解释原因，所以选择表原因的关系副词why。
根据explain及下文，可知时解释原因，所以选择表原因的关系副词why。
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