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  3. Which of the italicized parts indicates UNCERTAINTY?

Which of the italicized parts indicates UNCERTAINTY?

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问题 Which of the italicized parts indicates UNCERTAINTY?
选项 A、She can do it herself or ask someone else to do it.
B、The workers were cheerful, or at least they appeared to be cheerful.
C、They’ll stay here only a week or so.
D、Be careful, or you will break your neck.
答案C
解析 并列连词。A项表示选择；B项表示同位关系或改变说法；C项表示大约或不确定；D项表示否定条件。
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