i am not sure which side to take in argument_____facts are not cl_英语解答

i am not sure which side to take in argument_____facts are not clear.A.why B.where C.which D.that

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解答

选B where 相当于 in which ,把这个套到句子中才对,其他的都不符合语法规则.C 也不对,少了in