问题
trying to carry out the plan, butI failed.—Well, you _________, for we wereuncertain it would do ________.
A:needn’t do that, in fact
B:needn’t have done, in effect
C:needn’t have, in practice
D:needn’t, in time
B:needn’t have done, in effect
C:needn’t have, in practice
D:needn’t, in time
正确答案是：
