to be done 用法
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may have done用法小结
一条路。 may not/mightn't have done 表“可能不” 之前我们讲到过 can't/couldn't have...
can have done用法小结
done can have done干了?(表怀疑) He couldn't have checked out so early. ...
情态动词+have done的用法讲解
什么事。 7.He must have done sometime. Certainly he had always been je...
从零开始学语法:may have done用法小结
一条路。 may not/mightn't have done 表“可能不” 之前我们讲到过 can't/couldn't have...
case when用法
用法
从零开始学语法:can have done用法小结
done[/w] can have [cn]done干了?(表怀疑) He couldn't have checked out so...