The clock has just twelve. All the teachers should stop and let the students have a rest

问题补充：

The clock has just twelve. All the teachers should stop and let the students have a rest.

A. hit; to teach

B. beaten; teaching

C. struck; teaching

D. knocked; to teach

答案：

A. hit; to teach

B. beaten; teaching

(答案→)C. struck; teaching

D. knocked; to teach

解析：本题考查动词辨析和非谓语动词。strike(钟表)敲，鸣，报时；stop doing停止走某事。句意：钟刚刚敲12下，所有的老师都停止教学让学生休息。