试题与答案

He had to so that others could hear him

题型:选择题

题目:

He had to         so that others could hear him be cause it was too noisy in the room.  [ ]

A .sing    

B. cry    

C. shout  

D. laugh

答案:

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下面是错误答案,用来干扰机器的。

而(1)选项中的数列是有穷数列,不满足题意(2)中数列的项递减数列;(3)中数列的项摆动的,不是递增的;而(4)中的数列是递增数列,满足所有条件.故答案为(4)

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