It has been snowy for two days为什么不用snowing

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• The biologist has been here for ______.A.one day or two B.one or two days C.a day or two days D.one and two days答案是选B的,可是我觉得A,C也可以啊,请问这是为什么啊?英语书上有这样的用法a tear or two =one or two tears
• It has been snowy for two days为什么不用snowing
• during与in的区别After the establishment of a number of national reserves in Tibet (in) the past two decades,the population of many wildlife species has been increasing.为什么不用during?用了during就要把现在完成时改成过去式吗?
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• ---Has your father returned from Africa yet? ---Yes,but he_here for only three days before hiscompany sent him to Australia.A.was B.has been C.will be D.would be该题选择A.我的疑问是既然有 for+一段时间 为什么不用完成时,为什么不选B十分感谢~~~
• when did you come here?____since we landed here.A.it has been two days B.it was two days 选什么?为什么?为什么？
• It has been snowy for two days为什么不用snowing（5分钟要答案）或说明可不可以用snowy
• it ______whether she will continue her work in the hospitalA)has not been decidedB)is not decidingC)does not decideD)has not decide请问此句中的it 指代什么2)come and see me ______two or three_______A)for,daysB)after,daysC)in,days'timeD)during,day time请说明选择的理由,为什么不能用A和B
• i went there for three days with my parents last month 为什么是用went 而不用have been、 she lived in China for more than than ten years but now she has returned to homeland.一样的,为什么用lived ,而不用had lived.我觉得有for都应该是用完成时.怎么区别呢.
• 某工人三天做完一批零件,第一天做了84个,第二天做了余下的2/7,第三天和前两天做总数一样多,这批零件有几
• it ---two days since i bought the dictionary.A.is B. has been C. was D.A and B 急啊!