In this task you are given a sentence. You must judge whether the object of the main clause is singular(like: apple) or plural(like: apartments). Label the instances as "Singular" or "Plural" based on your judgment.
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Question: Her face was averted, the curtain of hair concealing her expression from him.

Answer: Singular


Question: Although we work in the same office, my husband usually keeps his suspicions to himself.

Answer: Plural


Question: He found many references that dated their civilization to have started about 2000 years ago.

Answer:
Plural