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
Help will come from the UN, but the aid will be ______ near what's needed.
A．everywhere
B．somewhere
C．nowhere
D．anywhere
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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