单项选择题

How long does the training period last

A．About three weeks.
B．At least half a year.
C．Two years or more.
D．Two to four months.
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What day is Halloween
A．December 31st.
B．October 31st.
C．November 4th.
D．November 1st.
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Why does the woman like San Francisco
A．People there are friendlier.
B．It has the best food and music.
C．It has less traffic.
D．It is advance
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