-----Who has made a mess in my room? -----Who else         it but your naughty son?
#63521
A
could do
B
could have done
C
did
D
had done
推荐题目
---Never touch my computer while I’m away. --- Sorry,  __________.
#74964
A
I shouldn’t 
B
I mustn’t 
C
I won’t
D
I don’t
Hurry up, or you ______ catch the train. 
#62829
A
needn’t
B
mustn’t
C
can’t
D
shouldn’t
—_____ you please play tennis with me? —Sorry, I _____.
#74769
A
Could; can’t
B
Could; couldn’t
C
Can; don’t
D
Can; couldn’t