The key ___the problem is to meet the demand___by customersA.to solving,making Bto solving,made C,to solving,making D,to solve,made

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Thekey___theproblemistomeetthedemand___bycustomersA.tosolving,makingBtosolving,madeC,tosolving,makin

The key ___the problem is to meet the demand___by customersA.to solving,making Bto solving,made C,to solving,making D,to solve,made
The key ___the problem is to meet the demand___by customers
A.to solving,making Bto solving,made C,to solving,making D,to solve,made

The key ___the problem is to meet the demand___by customersA.to solving,making Bto solving,made C,to solving,making D,to solve,made
选B,key to sth--某件事的关键.后面要跟名词,solving the problem是动名词,符合要求.made是被动语态,句子里是顾客所作出的要求.