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【单选题】
已知 为等差数列, =105, , 则 等于( )A.
-1
B.
1
C.
3
D.
7
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C.
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D.
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【单选题】听力原文：Q: How many people will attend the meeting? (15)
A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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