Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences given. Câu hỏi You'd better call him immediately. It's possible he'll leave for Paris. A. If he leaves for Paris, you should call him immediately. B. You'd better call him immediately as he possibly leaves for Paris. C. You'd better call him immediately so that he possibly leaves for Paris. D. You'd better call him immediately unless he possibly leaves for Paris.