We succeeded,after a good deal of _,in inventing the machine.[ ]A.trial and errorB.morning and night

题目简介

We succeeded,after a good deal of _,in inventing the machine.[ ]A.trial and errorB.morning and night

题目详情

We succeeded,after a good deal of _      ,in inventing the machine.        
[     ]
A.  trial and error                  
B.  morning and night        
C.  bittemess and hard              
D.  failure and success
题型:单选题难度:中档来源:同步题

答案

A

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