单选题
In such a large class the teacher has some difficulty______specific help to all the students.
【正确答案】
A
【答案解析】解析：语法题，此题考查学生对have difficulty(in)doing句型的掌握。类似的句型还有：have trouble(in)doing；have a hard(good)time＼fun＼problems+(in)+doing；find difficulty(in)donglose no time in doing等。