题目内容

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
从后文的将来时可以断定考试的结果还不确定，只是在进行推测，故排除A、C，D的语气不对，只有might表示语气不确定的“可能”，符合题意。
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