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Python程序设计单选题中等

以下代码中,能够正确将字符串 'Hello' 写入到文件中的是?

Awith open('file.txt', 'r') as f: f.write('Hello')
Bwith open('file.txt', 'w') as f: f.write('Hello')
Cwith open('file.txt', 'a') as f: f.write('Hello')
D以上均正确