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
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(shí)相反，主句應(yīng)用would/could…+have done。故選D。
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