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<p><span style="text-decoration: underline;">Find out which underlined part of the following sentence has an error.</span> Ceramics can be harde,(a)<span style="text-decoration: underline;">light</span> and more (b)<span style="text-decoration: underline;">resistant</span> to (c)<span style="text-decoration: underline;">hert</span> than (d)<span style="text-decoration: underline;">metals.</span>&nbsp;</p>

1. A a
2. B b
3. C c
4. D d