When people send a telegram they do not include unnecessary words because it ______the cos

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When people send a telegram they do not include unnecessary words because it ______the cost.

A.has increased

B.has been increased

C.increases

D.would increase

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗