It's said that ______ umbrella was invented over four thousand years ago by Chinese people

A.a B.an C.the D.\
我认为A也可以,一个可以代表全部嘛,但是答案是C
选哪个比较好

He said,"it talks.Ijust don't like it's impoliteness.Ibought it a week ago. "It is said that he has gone to Australia"里的it's said是什么意思 It\'s said that 和 It says that 有区别吗？ it's doesn't matter! It's not.....还是 It isn't..... ????? it's a love day,isn't it? yes,isn't it? sorry i shouldn't have said anything,please forget it这句翻译成中文是什么意思 It's easy to said than done中间的to到底要不要？ It's easier said than done. 语法上有错误吗？ 英语翻译:It's said most people will live to be100 years old in 50 years.