You will find the game is not so difficult to play ______ you understand its rules.
A．until B．sinceC．beforeD．once
D

試題分析：考查狀語從句。句意：一旦理解了比賽規(guī)則，你就會發(fā)現(xiàn)這個比賽并不難。A直到；B自從；C在......之前；D一旦。選A的話，意為“直到理解了規(guī)則才發(fā)現(xiàn)它很難”，不符合題意。故選D。
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