The student couldn’t what the teacher was trying to explain. A. recognizeB. graspC. study

问题补充：

The student couldn’t what the teacher was trying to explain.

A. recognize

B. grasp

C. study

D. achieve

答案：

A. recognize

(答案→)B. grasp

C. study

D. achieve

解析：考查词义。recognize认出，承认；grasp了解，理解，掌握；study学习；achieve获得，实现。句意：学生们不能理解老师正在解释的内容。所以选B.