单选题：Lifeisverymuchlikeamirror:whenyousmileuponit,__________itsmi

题目内容：

Lifeisverymuchlikeamirror:whenyousmileuponit,__________itsmilesbackuponyou. A．inturn
B．outofturn
C．byturns
D．ontheturn

参考答案：

答案解析：

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