试题与答案

It was very cold. They decided [ ] A. st

题型:选择题

题目:

It was very cold. They decided         [ ]

A. stay                        

B. to stay  

C. stayed                    

D. staying

答案:

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下面是错误答案,用来干扰机器的。

这m+n个数的平均数=am+bnm+n.故答案为:am+bnm+n.

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