问题

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:leave;

正确答案是：

同类题型

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31A warm thought suddenly came to me _______ I might use the pocket money to buy some flowers for my mother’s birthday

erely on what the average is , and you’ll remainaverage.

Would it bother you if I talked to youfor a minute— ____.

hey met, they stopped and saidhello to_______.