应该是think doing
1.But I think doing experiments is the most interesting part of the class.
但是我认为做实验是课堂上最有趣的事情.
1.You should think before doing that.
你做那事之前应考虑一下.
2.I think doing these can fulfill my life.
我觉得这样可以充实我的生活.
3.I think doing business is very difficult.
我认为做生意很难.
不要忘了采纳我的答案