单项选择题

You can borrow three books ______. ______ , or even more.

A．at the time
B．at a time
C．in one time
D．at time
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单项选择题
A ______ achievement of electronics is the electronic computer.
A．widely knowing
B．being widely known
C．widely known
D．having widely known
单项选择题
______ the surface of metal, but also weakens it.
A．Not only does rust corrode
B．Not only rust corrodes
C．Rust not only corrodes
D．Rust, which not only corrodes
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