• 2022-06-03
    If the research material is conventional and not a specific material reported in the paper, we use ( ).
    A: the present perfect tense
    B: the future tense
    C: the simple present tense
    D: the simple past tense
  • C

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      Generally speaking, in an abstract, the opening and concluding statements are written in the present tense or the present perfect tense, while the methods and results are expressed in the past tense.

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    • 2

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    • 3

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    • 4

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