Had the boy worked harder, he the exam.
A. must have got through
B. could get through
C. ought to get through
D. would have got through
网友回答
A. must have got through
B. could get through
C. ought to get through
(答案→)D. would have got through
解析：句意：如果那个小男孩再努力一点，他就能通过考试。这里是省略了if连词的条件状语从句，这里根据从句的谓语动词可知是对过去的虚拟，所以主句用would have done，故选D。