单选题 Context provides a variety of clues for inference of word meaning. Guess the meaning of the underlined words and say what contextual clues have helped you in arriving at the meanings. Contextual clues: A, B, C, D. Choose the best contextual clue for the determination of the underlined word in each sentence. He was in a mood of complete euphoria, his happiness being the result of an announcement that he had won the sweep-stakes