问题

Who ______ it be that is singing in the next room?— It _______ be Lucy, but I am not sure.
A:can ; may
B:may ; can
C:can; must
D:must; may
B:may ; can
C:can; must
D:must; may
正确答案是:
同类题型
ame good friends quickly, ______ourlife experiences couldn’t have been more different
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Thank you for __________ me to you party.
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