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Which is the best version of the underlined portion of sentence 10 (reproduced below)?
The violent act was caught on video and left many Americans stunned; stunned by both the violence of the terrorist act, but also at the openly racist and hateful displays of white supremacist groups that many Americans thought was a thing of the past.

A were a thing

This answer is correct because the verb is referring to “displays” and “white supremacist groups,” so it needs to be plural. That leaves only answers ” were a thing and ”were thing”. Answer ”were thing” does not work because the singular word “thing” needs the article “a” in front of it to make sense grammatically.