once or twice a week的问题.在英语中,表示约数不是：“基数词+or+基数词+名词”吗,为什么once or twice a week的表示也对呢?

once or twice a week 中文意思 once or twice a week 造句 The stadents exercise once or twice a week对once or twice提问 some sudents exercise once or twice a week Few students _____ homework once or twice a week once a week和twice a week my studen do homework three or four times a week no studen do homework once or twice a week 问:my studen do homework three or four times a week no studen do homework once or twice a week once ,only,some,a,twice,ewwk,or 把这些单词组成句子是week week.it .twice.some.or.once.only.a.eat.组成句子. once,week,some,a,exercise,students,twice,or,连词成句 no students do homework once or twice a week中student为什么加s 连词成句：do,don't,homework,twice,a,once,week,or,students (.) Some students exercise once or twice a once or twice a week的问题.在英语中,表示约数不是：“基数词+or+基数词+名词”吗,为什么once or twice a week的表示也对呢? I shop once or twice a month 划线部分 once or twice a month 提问 The students exercise (once or twice) a week .(对画线提问）_____ _____ ____ ____ the students exercise a week 一个英语问题,快乐连线①.sometimes A.100％②.always B.once a year.③.never C.once or twice a week.④.often D.0％⑤.hardly ever E.four or five times a week.