could be done是什么时态的被动语态
This, too, could be done at low cost。
这样也只需要花费很低成本。
He being absent, nothing could be done。
由于他缺席,什么事也没法干。
There was nothing that could be done now。
特尼现在做什么也无济于事。
This, too, could be done at low cost。
这样也只需要花费很低成本。
He being absent, nothing could be done。
由于他缺席,什么事也没法干。
There was nothing that could be done now。
特尼现在做什么也无济于事。