高等继续教育 / 旅游英语
正确率：100%
题型描述: 单选题
It suddenly occurred to him _ _ _ he had left his keys in the office.
A.which
B.whether
C.that
D.where
It suddenly occurred to him _ _ _ he had left his keys in the office.
A.which
B.whether
C.that
D.where
参考答案：
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