The poor boy _____ the test again; in that case, his mother will be very disappointed.
A．must have failedB．might failC．could have failedD．should fail
B
從后文的將來時可以斷定考試的結果還不確定，只是在進行推測，故排除A、C，D的語氣不對，只有might表示語氣不確定的“可能”，符合題意。
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