WHAT DOES THE PHRASE “STEPPING STONE” IN PARAGRAPH 4 MEAN

Câu 23: What does the phrase “stepping stone” in paragraph 4 mean? A. A person who travels without settling down for any significant period of time B. An important clue to understanding something that is challenging or puzzling. C. An action or event that helps one to make progress towards a specified goal. D. An asset or possession prized as being the best of a group of similar things. Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best completes each of the following exchanges from 24 to 25.