I'm suspicious really because at the back of my ..... I don't trust them

English as a Second Language English Vocabulary, Grammar and Idioms
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I'm suspicious really because at the back of my ..... I don't trust them. (*) brain (*) mind (*) idea (*) thought

This is a companion discussion topic for the original entry at https://english.best/questions/4604,im-suspicious-really-because-at-the-back-of-my-___-i-dont-trust-them/
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I more commonly hear “in the back of my mind.” rather than at.

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