国家开放大学 / 综合英语（3）
正确率：100%
_ _ _ _ _ the surface of metal, but also weakens its strength.
A. Not only rust corrodes（腐蚀）
B.Rust, which is not only corroded
C. Rust not only corrodes
D.Not only rust does corrode
A. Not only rust corrodes（腐蚀）
B.Rust, which is not only corroded
C. Rust not only corrodes
D.Not only rust does corrode
参考答案：
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