南昌市2014
高考英语单项选择训练（9）及答案解析 1．the research mainly deals with the difficulty the students have ______ their attention pm their study all the time. a. to focus b. to be focused c. focusing d. focused 《答案》c 《解析》
试题分析：have difficulty (in)doing sth在做某事方面有困难 the students have…为定
