exercise、surf.drink的复数,现在进行时,过去式是什么?

exercise、surf.drink的复数,现在进行时,过去式是什么? peel surf tour hum exercise的过去式 过去分词 1.How often do they drink orange?H____ ever 2.How often do you exercise?T____ a week1.How often do they drink orange?H____ ever2.How often do you exercise?T____ a week3.What do you usually do on weekends?I usually surf the I____ surf the Internet的surf是什么意思 surf的过去式是什么? surf的过去式是什么? surf的过去式 surf 的过去式 surf的复数形式 surf的过去式 surf的意思 I drink milk ______ .I ______ exercise. surf the Internet的中文 surf the Internet的过去式 surf的单三形式 surf和vocational的意思 谁知道surf的中文意思? surf算法的matlab程序,