执行以下代码后，file.txt 文件的内容是？（ ）
with open('file.txt', 'w') as f:
f.write('First line\n')
with open('file.txt', 'a') as f:
f.write('Second line\n')
with open('file.txt', 'r+') as f:
f.seek(0)
f.write('Replaced first line\n')
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