单选题：Withoutquestion,people'slivesinChinahaveimproveddramatically

题目内容：

Withoutquestion,people'slivesinChinahaveimproveddramaticallyinthepasttwodecades. A．Outofthequestion
B．Nodoubt
C．Naturally
D．Obviously

参考答案：

答案解析：

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