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 didn’t tell him the news.—Oh, you ought _______.
#63528
A
to   
B
not to
C
not to have  
D
to have
 Few weight-loss pills can help to keep people slim, _______?
#74637
A
do they
B
dodt they
C
can't they
D
can they