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

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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

单项选择题

Let's ______ when the ship will arrive.

A．find out
B．discover
C．find
D．invent

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