The invention of the typewriter was a great to munication and printing.
A. contribution
B. devotion
C. revolution
Dconstruction
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(答案→)A. contribution
B. devotion
C. revolution
D. construction
解析：本题的含义是打印机的发明对于印刷行业所起的贡献很大，contribution表示贡献的意思，故本题选C。