This type of heater is a good choice for the quick heating of enclosed spaces. However, it should not be left______.

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问题 This type of heater is a good choice for the quick heating of enclosed spaces. However, it should not be left______.

选项 A、unused
B、unorganized
C、unattended
D、unexpected

答案C

解析空格位于“取暖器不可无人看管”的内容之后，因此要填入描述取暖器无人看管的状态的分词词汇。意为“无人照料的；无人看管的”的unattended在上下文中最合适，将其看作leave something unattended(放任／放着……不管)的被动形式即可。

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