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Which sentence is correct and why?

5 個月前
1) There are three tests and EVERY lasts for one hour. 2) There are three tests and EACH lasts for one hour. 3) There are three tests and EACH OF THEM lasts for one hour.

Thank you!
each
every
grammar
english grammar

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Jackie
Flag英語1 天前
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jackie
idioms
idiomatic expressions
advanced grammar
fluency
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common.languages.
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用戶加入時間:: 2016年9月10日