单项选择题

A．Make an appointment with Dr. Chen.
B．Wait for about three minutes.
C．Call again some time later.
D．Try dialing the number again.
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单项选择题
A．Because the mountain is over 12,000 feet high.B．Because he had no experience since he left college.C．Because his wife wasn’’t good at mountain climbing.D．Because his children were too young.
A．Because the mountain is over 12,000 feet high.
B．Because he had no experience since he left college.
C．Because his wife wasn’’t good at mountain climbing.
D．Because his children were too young.
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