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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Let's ______ when the ship will arrive.
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B．discover
C．find
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There ______ some mistakes in your composition.
A．have
B．has
C．seems to be
D．seem to be
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