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I'm in the same situation, and have just come across Brainscape: https://www.brainscape.com They have a really good (at first glance) Chinese business vocab list which is free. It uses flashcards. Very nice interface Cheers Charlie
The best I know of is Chinese: A Comprehensive Grammar (Routledge Comprehensive Grammars) by Yip Po-Ching and Don Rimmington.
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