Dogs like a lot of exercises.we often walk them in the park.it is important for everyone to doexercise every day .两个句子中的exercise意思都一样为什么前者是复数,后者是单数呢?
问题描述：
Dogs like a lot of exercises.we often walk them in the park.it is important for everyone to do
exercise every day .两个句子中的exercise意思都一样为什么前者是复数,后者是单数呢?
答