I think that doing lots of listening ,that 后面为什么用动词的ing形式?为什么用that ,可以去掉吗?

i think doing sth I think 后跟doing 我认为那样做是毫无意义 的.I think doing( )that is ( ). I think that doing exercise can help to build me up这个句子 英语翻译Thank you for your honest reply and I understand your situationreally.I think that you must not suffer a lot of loss in doing businessat your local side and int'l trade etc 英语问句问：what do you think of sth?我可否回答：I think of doing sth is...用I think （that）do sth is... I THINk DOING吗是i think doing,还是i think do I think doing sports is great --------(fun) 4.I was so angry at all that he was doing that l walked out这里的at all that he was doing 是做什么成份的 I think that if you don't want to do can need not doing,but the truth is I think the I think that doing lots of listening practice is one of the secrets of becoming a good I think that doing lots of listening practice is one of the secrets of becoming a good language I think that doing lots of listening ,that 后面为什么用动词的ing形式?为什么用that ,可以去掉吗? 任何一个动词后面加句子中间都是省略that 如：I think that doing homework is good这个句子是不是可以省略 that 是不是 从句 以I think that造句 that's what i think I also think that you I'm think about that. i think that that that that that is