题目

请解释生活中用汽油洗掉油污和洗洁精洗去油污的区别？ 答案：油污可以溶解在汽油里；洗洁精具有乳化作用        All of us were so excited at the news ________we’re going abroad for holidays_________we jumped with joy.      A. that; that              B. what; and that      C. what; that        D. which; so