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【单选题】
已知数列 通项公式为 ,则此数列为( )A.
是公差为3的等差数列
B.
是公差为5的等差数列
C.
是公差为n的等差数列
D.
是首5的等差数列
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A.
at
B.
in
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down
D.
up
【简答题】She completely lost her voice and had to give _____ teaching.
【单选题】She completely lost her voice and had to give _____ teaching.
A.
to
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up
C.
on
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