In this task you are given a sentence. You must judge whether subject of the main clause is singular or plural. Label the instances as "Singular" or "Plural" based on your judgment.
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Question: " Let me get a picture of everyone, " her grandmother said, her voice slightly strained.

Answer: Singular


Question: A mass of recruits had already gravitated to the Whites.

Answer: Singular


Question: As far as she knew, only a few members of the Business Association had keys to the Liaison's Office.

Answer:
Plural