We must know what we should do and what we should avoid _______ a good impression on others in public places.
A．to leaveB．leavingC．to have leftD．leave
A

試題分析：句意：在公共場(chǎng)合，為了給其他人留一個(gè)好的印象，我們必須知道我們?cè)撟鍪裁�，我們�?yīng)該避免做什么。表示目的“為了……”，故用不定式，選A。
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