The key----the problem is to meet the demand made by the cus

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The key----the problem is to meet the demand made by the customers.A.to solve B.to solving
选哪个,为什么

选B.to solving
the key to + 动名词
再问：那怎么解释the time to go等用to do 的呢？
再答： the key to doing sth.中, to 是作为介词形式. the time to do sth.中, to do 是动词不定式.
再问：可这两个不是很像吗，那怎么才能知道这个词后面的to是介词还是不定式？
再答： the key to doing sth. the time to do sth. 以上都为固定搭配. 要判断to是介词还是不定式, 就根据语法/语境去判断.

The key----the problem is to meet the demand made by the cus the key to solving the problem is to meeet the demand made b The key ___the problem is to meet the demand___by customers the best way to solve the problem is by putting off the meet the key to solve the problem is to _____ trees The key to solving the problem . The key to solving the problem Key__(solve) the problem is to meet thr damand__ (make)by th the key to the 英语翻译To meet the demand for production and precision,research --How do you deal with the.--The key ___the problem is to me the key to the bike is missing