That ___ has been in the river for hundreds of years.
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weir
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we're
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Dummy choice 1
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Dummy choice 2
A
Correct answer
Explanation
'Weir' is a low dam built across a river to regulate water flow or raise water level. 'We're' is the contraction of 'we are'. The context describes something that has existed in a river for centuries, which fits a physical structure like a weir.