--Listen! Someone is knocking at the door.-- ______ be Mary. She has just been to Beijing
#89781
A
She mustn’t
B
It can’t
C
It must
D
She may
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Thank you for all your hard work last week.I don’t think we ______ it without you. 
#90551
A
can manage
B
could have managed
C
could managed
D
can have managed
You must be a writer, _____?
#90135
A
mustn’t you
B
are you
C
must you
D
aren’t you