What are the possible contents of an introduction?

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What are the possible contents of an introduction?

A.Reviewing the existing literature relevant to the present study

B.Announcing the purpose/focus of the study

C.Identifying a gap in the existing literature

D.Explaining the significance or necessity of the research

参考答案:

答案:Reviewing the existing literature relevant to the present study;Announcing the purpose/focus of the study;Identifying a gap in the existing literature;Explaining the significance or necessity of the research