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میتونی لایو بذاری!

During the 17th century, more and more people began to realize that they could test their scientific ideas by designing a relevant experiment ............. .

1 ) 

and seeing what happened

2 ) 

to see what was happened

3 ) 

and what happened to see

4 ) 

for seeing happened what

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سید مصطفی حسینی