'There is an unprecedented number. '
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Anonymous"There is an unprecedented number of opportunities.""There are an unprecedented number of opportunities."There are an unprecedented number of opportunities.
Rover_KE'There is an unprecedented number. . .'You can't say *There is an unprecedented number of opportunities. The meaning of the quantificational noun number when used with the determiner an is imprecise, so the embedded noun opportunities must be plural, and likewise the form of the verb. So it should be: