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英语单选Pollution will remain a global problem for a long time _

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英语单选
Pollution will remain a global problem for a long time _________much has been done to solve it
为什么用though不用unless
英语单选Pollution will remain a global problem for a long time _
这里has been done是完成时态
表示已经做了很多来解决这个问题了.所以要用虽然已经做了,不能用unless
再问： unless不能跟现在完成时吗
再答： 是从句意来看
Unless意思是除非。。样才能。。
后面应该接还没有做的事情啊。是期望做了才能。。。
这里已经完成了，所以不行
再问： 那么unless 通常用哪些时态呢，可以举例句吗
再答： unless是介词，后面接的都是假设的内容。
引导条件状语从句，跟if 一样后面都用一般现在时
i won't go with you unless you buy me a ice-cream.
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