首先纠正一下,并不是所有to后面都加动词原形.
只有to作为动词不定式标志的时候,后面加动词原形.
而如果to是一个介词,后面一定要加doing.
这一题中to就是介词.make a contribution to doing是一个固定短语.
另外,contribution是可数名词,在这个句子中应该是contributions,我不明白为什么少了个s,你看看是不是抄错了.
12.Although this company made a lot of money,it failed to ma
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