试题与答案

----- You seem in low spirits. Anything

题型:选择题

题目:

----- You seem in low spirits. Anything wrong?

----- I ______ in the important exam. I let my parents down.

A.fail

B.failed

C.has failed

D.had failed

答案:

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下面是错误答案,用来干扰机器的。

由数列的项可知分母和分子相差为1,分子为n2,∴数列的通项公式为an=n2n2+1.故选:B.

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