问题补充：
Their problem today is somewhat similar to( ) they faced many years agoA thatB whichC that whichD it求详细分析下这句子.
答案：
答案选择C.
原因：当一个句子的前面出现的名词,在后面再次出现可用代词that(单数）,如果后面直接接定语从句不太合适,因此应用which（因前面有了that)来引导该定语从句.这里的that指代前面的the problem 然后有了that 之后 要用which来修饰这个that
译文：今天的问题和他们在多年之前面对的问题有些相似.
======以下答案可供参考======
供参考答案1:
Cthat指代the problem,which引导定语从句，在介词+whom与介词+which中，whom,which不能省略，这句话属于这种情况to +which
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