I am facing a dilemma and am unable to determine which is correct:
... until any one of the following conditions have been met:
... until any one of the following conditions has been met:
Any advice is appreciated.
Similarly, whilst writing: ... at least one of the following events occurs: ... at least one of the following events occur:
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Similarly, whilst writing:
... at least one of the following events occurs:
... at least one of the following events occur: