单项选择题

When spring comes, the trees are ______.

A．in a flower
B．in flowers
C．in the flower
D．in flower
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______ you a president or an ordinary person, you will be punished if you commit a crime.
A．May
B．However
C．Are
D．Be
单项选择题
A series of seminars ______ scheduled.
A. has
B. is c. /
D. are
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