The background music in an assembly line is designed ____________(不被听到).

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问题 The background music in an assembly line is designed ____________(不被听到).

选项

答案not to be listened to

解析 本题考查对不定式的被动式和否定式的掌握。不定式的被动式的基本式为:to be done.;而不定式的否定式是直接在小品词to前加上not。
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