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Python程序设计单选题中等

在文件读取完成后,使用with语句自动关闭文件,以下哪项是正确的做法?

Awith open(file_path) as f: f.read()
Bwith open(file_path, 'r') as f: read(f)
Cwith open(file_path, 'r') as f: f.read()
Dwith open(file_path) as f: read(f)