iswellknown,凭感觉者请勿做答,请给出权威解释.iswellknown,saidourheadmaster,thatgreatchangeshavetakenplaceinourschoolinthepasttwentyyears.A.AsB.ThatnC.ItD.WhichB打错了，多了个n我认为C好

Question

_______ is well known,凭感觉者请勿做答,请给出权威解释.
_______ is well known,said our headmaster,that great changes have taken place in our school in the past twenty years.
A.As B.That n C.It D.Which
B打错了，多了个n
我认为C好点，如果选as，我认为应该删掉that.答案肯定是在it 和as中选。

Answer 1

选C.这句中it 是形式主语,真正的主语是 that great changes.