The poor boy the test again; in that case, his mother will be very disappointed.
A. must have failed
B. might fail
C. could have failed
D. should fail
网友回答
A. must have failed
(答案→)B. might fail
C. could have failed
D. should fail
解析：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。