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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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B.
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C.
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D.
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B.
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C.
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B.
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C.
是无限的
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B.
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【单选题】After three full hours of laboring over the market report, he stood up, went outside and ______ his back.
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【单选题】—How do you like our new teacher? — Very ______. He often says something new to make us laugh.
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