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  3. ______ the surface of metal, but also weakens it.

______ the surface of metal, but also weakens it.

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问题 ______ the surface of metal, but also weakens it.
选项 A、Not only does rust corrode
B、Not only rust corrodes
C、Rust not only corrodes
D、Rust, which not only corrodes
答案C
解析 A强调的是主语rust，它后面应有另一个名词与其相对应。B没有倒装，故错。 C强调corrode，后半句又有另一个动词weaken与其对应，故为正确答案。D not only．．．but also并列在从句中，主句无谓语，所以也不对。
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