题目

--- Was it under the tree __________ you were away talking to a friend? --- Sure. But when I got back there, the bike was gone. A. that          B. where         C. which                D. while 答案：D某种型号的手机自投放市场以来，经过两次降价，单价由原来的2000元降到1280元，则这种手机平均每次降价的百分率是A.10%B.15%C.18%D.20%