Inmyopinion,thekey

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In my opinion, the key _____ the problem is _____ rather than argue.

A. to solving; to cooperating B. to solve; to cooperate

C. to solve; cooperate D. to solving; to cooperate

D。 the key to doing sth is to do sth 意为“……的关键是……”。key后面的 to是介词，后接动词-ing形式；第二个空为动词不定式作表语。句意为：依我的观点，解决这个问题的关键就是合作，而不是争吵。