provided that 和 on condition that有什么区别?
这两个都表示"如果",区别在哪?
I'm sorry you have decided not to go with us on the river trip,but ____ you change your mind,there will still be enough room on the boat for you.
A.even B.provided that C.nevertheless D.on condition that
这题选B还是D?为什么?
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已经知道为什么勒....字典里查到勒...