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单选题
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

参考答案

参考解析
解析：
句意：正如电话网络中每加入一部电话，这个网络的价值就会增加，计算机系统中每添加一个程序，这个系统的价值也会增加。本题使用just as…so的句型，意为“正如…也”。由于已经有了谓语动词increases，所以add只能用其非谓语形式，又因被修饰的名词phone与动词add之间是动宾关系，所以应用add的过去分词，表示被动的含义。
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