It's fun ____________(see) all my friends.
3个回答

1. have fun doing sth 意思是做某事做得很愉快.

2. 主语 + be + adj + to do 表示即将做.比如: I’m happy to help you. 我很高兴帮助你.

3. 主语 + be + adj + doing 表示已经做做.比如:It's nice meeting you. 见到你很高兴.

此题to do ,doing 语法上都正确,但是根据句意应用doing较好.

:)