单项选择题

21()

A．number
B．amount
C．numbers
D．members

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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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