Some types of social networking site are popular but access is usually ________

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问题 Some types of social networking site are popular but access is usually ________ to teenagers and children.

选项 A、allowed
B、available
C、off limits
D、out of order

答案 C

解析本题考查动词和短语辨析。句意：有些类型的社交网站很流行，但青少年和儿童通常是禁止访问的。allow允许；available可获得的；off limits禁止入内；out of order发生故障，混乱，失调。结合句意可知，答案为C。

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