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：通过again和in that case, his mother will be very disappointed.可知这是对将来情况的一个猜测，答案B。