. I supported him in time , otherwise he ______ off the bike .

         A．might fall              B．would fall   

         C．should have fallen    D．would have fallen

D


解析:

otherwise 否則，相當(dāng)于if not。本句可改為： if I hadn’t supported him in time, he ___off the bike。顯然，這是與過去事實相反，主句應(yīng)用would/could…+have done。故選D。

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