That he finished writing the composition in such a short time surprised us all.如题,请分析句子结构,句子前面的that有什么用额

I believe that he has finished his work的翻译 It is possible that he hasn't finished his work.同义.It is ()()that he hasn't finished his work He commanded that the work before 5 o'clockA.was finished B.should finished C.would be finished D.be finished为什么选D? It seems that he finished his homework.用seem to do怎么换同义句 It is not until midnight that he finished the report.为什么不填when? It seemed that he had finished his homework改为简单句 he finished the same work at the same time that i did 哪里错了 seems incredible that he could have finished the work so soon. The boy was surprised that he finished the work alone 改为两个同义句 It seemed that he finished his word in time （改为同义句） he came out and told us that the work_____.Afinished Bwasfinished c hadfinished Dhad been finished he worked so hard that he finished it successful at last 句型转换十分钟左右给答案 It was not until he finished his homework that ___home A did he return B was he returnedC he did return D he returned He thought a new road was being built and that it would be finished soon.中间that能否去掉, He finished the task easy. Is it this room ----- the great writer once lived ------ he finished his last works?A where;that B that,where C that;which Dthat;that Never did he expect that the project was finished so fast.Never did he expect that the project had been finished so fast.这两句语法有没错误?意思一样吗? It --------- that he has finished all the homework.A.seems B.seemed C.lookD.gose hiking说明理由