问题补充：
The purpose of new inventions is to make life easier,it more difficult.
A. not make
B. not making
C. not to make
D. do not make
答案：
A. not make
B. not making
(答案→)C. not to make
D. do not make
解析：句意：新发明的目的是为了使生活更容易，而不是使生活更难。is to do sth, not to do sth 是要做……,而不是做……。所以要选C。
考点: 考查非谓语动词的用法。
