单选题：The expression "play safe" probably means______

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The expression "play safe" probably means______ A．to write carefully
B．to do as teachers say
C．to use dictionaries frequently
D．to avoid using words one is not sure of

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The students had a lot of trouble concentrating on their stu

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关闭一台运行Windows XP的计算机之前，系统自动先（　　）。

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