SAT Reading & Writing · Form, Structure, and Sense

The novel's ending, along with several plot threads left unresolved in the middle chapters, ______ frustrated many longtime readers of the…

The novel's ending, along with several plot threads left unresolved in the middle chapters, ______ frustrated many longtime readers of the series.

Which choice completes the text so that it conforms to the conventions of Standard English?

Answer and explanation

Answer: D: has

The sentence's grammatical subject is "the novel's ending," a singular noun; "along with several plot threads left unresolved" is a parenthetical phrase that adds information without changing the number of the true subject, calling for the singular *has*. *Have*, *were*, and *are* are all plural, incorrectly treating the parenthetical plot threads as part of a compound subject instead of as a modifying phrase attached to the singular main subject.

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