It is still a problem to hide the stolen money. A. whyB. whichC. where D. who

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A. why
B. which
(答案→)C. where
D. who
解析：考察it作为形式主语。It是形式主语，where to hide the stolen money是正在的主语。结合句意可知：把偷来的钱藏在那里仍然是一个问题。