– Why you didn’t handed in your exercise paper?–Sorry, but I ____ that it should be turned in today.
#100688
A
didn’t know
B
hadn’t known
C
haven’t known
D
don’t know
推荐题目
 Give me an undisturbed hour and I ________ the work Tom has left unfinished.
#99213
A
see to
B
will see to
C
would be seeing to
D
have seen to
You can’t imagine the difficulty he _____ onto the cliff and saving the boy in trouble. 
#103306
A
had to climb
B
had climbed
C
had climbing
D
had on climbing