You must know that he is bad ( ) you though you haven't ( ).A. for,seen it B.to, fount it C. to, found that out D. for, found out it 是选C吗?Why?
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首先否决掉A的seen it(see是指看,To perceive with the eye,单指动作)和D的found out it（应该是found it out,只有名词才能放在find out中间,而it是代词).
再否决B(find是指to e upon after a search)
所以选C.find out 指发现查明真相.
======以下答案可供参考======
供参考答案1:
是选C ,句子意为：你必须知道他对你会有害，尽管你还没有发现。
首先主句中he is bad to有固定结构be bad to:对……有害、对……不好，排除A,D
从句中haven't found that out，相当于found out that,其中that指代he is bad to you，find out意为发现，因此不能单用find,排除A,B
所以选C供参考答案2:
选Cthat 指前面的事实
虽然你还不知道真相,但你肯定知道他对你不好.