问题补充：
Students should pay attention to the teacher in class.
A. hear
B. listen to
C. listening to
D. hearing
答案：
A. hear
B. listen to
(答案→)C. listening to
D. hearing
解析：此题重点考查固定句型结构pay attention to doing sth表示注意某事，其中to是介词后跟动词时一定要用动词的ing形式。听老师讲课常用动词listen to，而hear强调听到的内容。
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