单项选择题

You must have got up late this morning, ______

A. mustn't you

B. haven't you
C. have you
D. didn't you
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单项选择题
We find that some birds ______twice a year between hot and cold countries.
A. transfer
B. migrate
C. commute
D. mobilize
单项选择题
A series of seminars ______ scheduled.
A. has
B. is
C. /
D. are
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