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Which sentence correctly forms the plural of 1900?

a. Was the helicopter invented in the 1900s?
b. Was the helicopter invented in the 1900's?<=my ans b
c. Was the helicopter invented in the 1900s'?

User Numski
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1 Answer

3 votes
It b i took the test got a 100%

1900's ('s) stands for that time and place
User Mororo
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