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.addingB.to have addedC.to addD.added在线课程D
A、B、C、D四个选项的意思都是“增加”．add sth．to sth．意思是“给……增加”，to前缺少宾语；此外，根据with sth．+done 的结构，D项符合题意．
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