单项选择题

22()

A．the more
B．better
C．the most
D．fastest

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单项选择题
21()

A．number
B．amount
C．numbers
D．members
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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