As it turned out to be a problem of no importance , we     so much time looking into it . 
#62607
A
needn’t spend
B
didn’t have to spend
C
needn’t have spent
D
oughtn’t to spend
推荐题目
I am feeling sick now.I ________ so much chocolate.
#63485
A
needn’t have eaten
B
couldn’t have eaten
C
mustn’t have eaten
D
shouldn’ t have eaten
----I passed the college entrance examination.----Congratulations! You________.
#63093
A
could have studied hard
B
must have studied hard
C
should have studied hard
D
might have studied hard