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<p>A doctor may be able to (a)<strong><span style="text-decoration: underline;">diagnose</span></strong> a problem (b)<strong><span style="text-decoration: underline;">perfect</span></strong>, but he may not be able to find a drug (c)<strong><span style="text-decoration: underline;">to which</span> </strong>the patient (d)<strong><span style="text-decoration: underline;">will respond</span></strong>.</p>

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