Is that your best friend Kitty?— No, it _________ be her. She flew to Singapore yesterday.
#75926
A
must
B
can
C
Mustn’t
D
Can’t
推荐题目
 It was very kind of you to do the washing-up but you _____ it
#62541
A
needn’t do
B
shouldn’t do
C
mustn’t have done
D
needn’t have done
I will come _____ I don’t change my mind. 
#75176
A
unless
B
if
C
because
D
though