Several accidents ___(happen) in this place over the years.

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Several accidents ___(happen) in this place over the years.
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Several accidents ___(happen) in this place over the years.
Several accidents ___(happen) in this place over the years.

Several accidents ___(happen) in this place over the years.
have happened
over the years表示从过去延续到现在,所以动词应该用现在完成时.

have happened

have happened
过去这些年,这个地方发生过很多起事故。