单项选择题
Questions 11 to 18 are based on the conversation you have just heard.
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A.Five lessons.
B.Three lessons.
C.Twelve lessons.
D.Fifteen lessons.
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单项选择题
A.ButB.ForC.StillD.And
A.But
B.For
C.Still
D.And
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填空题
essential。
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