The research mainly deals with the difficulty the students have ______ their attention pm their study all the time.A.to focusB.to be focusedC.focusingD.focused
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C解析试题分析：have difficulty (in)doing sth在做某事方面有困难 the students have…为定语从句，省略了连接词that.故选C考点：have difficulty (in)doing sth在做某事方面有困难点评：本题重在分析句子内部结构，及句型的识别。此类题无非就是中间夹杂着从句，尤其是宾语从句，让学生没法分清楚内部的逻辑关系，这种能力的培养，需在老师的指点下，也需要学生不懂就要多问。