Just as the value of a telephone network increases with each new phone ______ to the system, so does the value of a computer system increase with each program that turns out._门捷列夫

Just as the value of a telephone network increases with each new phone ______ to the system, so does the value of a computer system increase with each program that turns out.

A

adding

B

to have added

C

to add

D

added

答案

D

解析

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