We'd better take umbrellas ----i'm sure it ___when we arrive

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We'd better take umbrellas ----i'm sure it ___when we arrive in london ;it is always wet there at this time of year.
A will rain B is raining C will be rain D would rain

选择B is raining
解析：
进行时态表示的将来指的是根据规律必然会出现的情况.上文已经指出I’m sure,而且下文还有it is always wet there at this time of year,说明此处是预料中的将来..
A 项will 指的是一种可能性,与上下文指出的情况不符.
C 项中rain是名词,单数表示“雨水”,意思说不通.倒是可以用表示“雨天/雨季”的复数形式rains的语态,但是will 指可能性,意思不对.
D 项的would过去的习惯动作,与时间状语从句中用现在时态when we arrive in London 表示的将来在时间上不能衔接.
再问：不好意思啊~我题目刚刚抄错了，正确的是We'd better take umbrellas ----i'm sure it ___when we arrive in london ;it is always wet there at this time of year. A will rain B is raining C will be raining D would rain麻烦您重新帮我看一下好吗
再答：上下的题目完全，没有抄错。用 it is raining when we arrive in london 意思是“我确信我们到达伦敦的时候天会正下着雨，（因为）一年中的这个时候气候总是潮湿的）”.用 it will rain when we arrive in london 意思是“我确信我们到达伦敦的时候天有可能会下雨（言外之意是到达时暂时还没雨）”.

再问： C项不是will be rain 而是will be rainning。我在追问中改过来了。答案选C。
再答：如果有 will be rainning，那么它就是最佳答案，从句 when we arrive in london 是用现在时态表示将来，那么主句也要用将来时态，is raining 虽然可以表示将来，但是属于计划中安排好的将来，而 will be raining 都则表示到时候有可能在进行着的将来。在没有后者的情况下，只能勉强选择前者。

I'm sure we will. I think we'd all be a lot better off if we could take off fi You'd better take some ___when you are in London. 一段英文,准确翻译、I’m not sure how we’ll reach that better place bey __we' ve got to know each other better,I m sure we' ll have we didn't take umbrellas with us还是umbrella It looks like .We'd better take an umbrella A rain B rains C 如何提问 I'm sure we will. we had better move this table there as it __ (take up) too m 英语翻译A:We’d better make sure we get to the presentation early I am sure we I only said it'd be better if we weren't friends,not that I