The purpose of new inventions is _______ life more difficult, but to make it easier.
A．not makeB．not making
C．not to makeD．do not make
C

試題分析：句意：新發(fā)明的目的不是使生活更加困難，而是使其更加容易。本題用to do不定式做目的狀語,否定形式在不定式前面加not。故選C。
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