摘要：Just as the value of a telephone network increases with each new phone to the system , so does the value of a computer system with each program that turned out. A. adding B. to have added C. to add D. added
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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