Wemustknowwhatweshoulddoandwhatweshouldavoid

来源：语文精选馆 3.19W

We must know what we should do and what we should avoid ________ a good impression on others in public places.

A．to leave B．leaving

C．to have left D．having left

A　考查动词不定式作目的状语。句意：为了在公共场合给别人留下一个好的印象，我们必须知道我们应该做什么，应该避免什么。