Mark the letter A,...

Câu hỏi: Mark the letter A, B, C or D on your answer sheet to choose the sentence which is closest in meaning to the one in bold.
When I heard the telephone ring, I answered it immediately.

A.   On hear the phone rang, I answered it immediately.

B.   On hear the phone ring, I answered it immediately.

C.   On hearing the phone ring, I answered it immediately.

D.   On hearing rang, I answered the phone immediately.