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<p><span style="text-decoration: underline;">Each sentence below has three underlined parts having words or phrase marked A,B and C.Identify one of the underlined parts that must be changed to make the sentence correct.If the sentence needs no correction,the answer D is to be marked.</span> (a)<span style="text-decoration: underline;">Hearing</span> the strange noises, it (b)<span style="text-decoration: underline;">at once</span> occurred to me that some one (c)<span style="text-decoration: underline;">had</span> entered the house .(d)<span style="text-decoration: underline;">No Error</span></p>

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