Madonna ____a straight A student,but it was dancing that she was really crazy about.   
#89032
A
must be
B
could be
C
must have been
D
could have been
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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