来自常志红的问题
【Wedomorningexerciseaftertwolessonsinthemorning.改错】
Wedomorningexerciseaftertwolessonsinthemorning.改错


【Wedomorningexerciseaftertwolessonsinthemorning.改错】
Wedomorningexerciseaftertwolessonsinthemorning.改错
exercise改成exercises
exercise泛指运动,锻炼时,是不可数名词
指早操,眼保健操等具体某项运动,或者练习题时,是可数名词