基本信息
第二部分：英语知识应用
第一节：单项填空（共15小题；每小题1分，满分15分）
21．Have the problems they have ________ been solved?
A．concentrated B．concentrating C．concentrated on D．concentrating on
22．I have ________ all my papers, but I still can’t find my notes.
A．looked through B．looked for C．looked after D．looked out
