Grammar – A Batch of Papers Has/Have Arrived.

Generally, a subject consisting of a singular noun plus an of-phrase takes a singular verb: A flock of sheep was seen in the distance. But there are some exceptions:
A vast quantity of fakes were released onto the market.
The ‘notional’ meaning here (see the chart, Notional agreement, below) is clearly ‘many fakes’ – hence the plural verb form.
Sometimes the choice of verb can affect the meaning. A vast quantity of fakes was released onto the market suggests that they all came from one source; using were avoids this suggestion.
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