exercises共3篇 exercise和exercises的用法exercise和exercises的用法：exercise可作名词和动词，当作名词时... do morning exercises是单数还是复数复数。do morning exercises意思是做早操，exercise既是不可数名... morning exercises是单数还是复数复数。morningexercises意思是早操，exercise既是不可数名词，又...
