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Read the excerpt below and answer the question.
He sat by the clock in the villa, when his mother was not near, and checked his time. He was incredulous and
then proud to find that he could hold his breath without strain for two minutes.
Choose the best synonym for the word incredulous as it is used in this excerpt from Doris Lessing's short story "Through
the Tunnel."
amazed
disappointed
skeptical
unsure