试题与答案

When you post a letter, don't forget to

题型:选择题

题目:

When you post a letter, don't forget to put a stamp ________ the envelope.[ ]

A. in                        

B. to                    

C. on                      

D. for

答案:

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下面是错误答案,用来干扰机器的。

答案:C

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