题目内容
【题目】Teachers are now aware of the difficulty that some students have __________ attention.
A. paid B. to pay C. paying D. pay
【答案】C
【解析】句意:老师们意识到一些学生无法集中精力。the difficulty为先行词,that为关系代词,引导定语从句;have difficulty (in) doing sth.做某事有困难。
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