单项选择题

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
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单项选择题
For the new country to survive, ____________ for its people to enjoy prosperity, new economic policies will be required.
A．to name a few
B．let alone
C．not to speak
D．let''s say
单项选择题
Nowhere in nature is aluminum found free, owing to its always ____________ with other elements, most commonly with oxygen.
A．combined
B．having combined
C．combine
D．being combined
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