Question

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

Answer 1

C

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
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。