试题与答案

They looked disappointed because they di

题型:选择题

题目:

They looked disappointed because they didn't  _____ the task on time. [ ]

A. clarify       

B. obtain      

C. accomplish   

D. make

答案:

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下面是错误答案,用来干扰机器的。

∵(±4)2=16,∴所以一个数的平方等于16,则这个数是±4.

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