题目

 ---John, why are you so upset?  ---I­­­       my cell phone all morning but it is nowhere to be found.    A. am looking for               B. have been looking for        C. have looked for              D. had looked for 答案：B15．上海将建95层高达460米至470米的世界级高楼，大楼计划投资882000000美元．读作：八亿八千二百万．