问题

What happened to the young trees we planted last week?—The trees _well, but I_them.
A:might grow; hadn't watered
B:needn't have grown; didn't water
C:would have grown; didn't water
D:would grow; hadn't watered
B:needn't have grown; didn't water
C:would have grown; didn't water
D:would grow; hadn't watered
正确答案是: