It is a waste of time ( ) that againA.say B.said C.to say D.saying

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It is a waste of time ( ) that againA.say B.said C.to say D.saying

It is a waste of time ( ) that againA.say B.said C.to say D.saying
It is a waste of time ( ) that again
A.say B.said C.to say D.saying

It is a waste of time ( ) that againA.say B.said C.to say D.saying
正确:C It is a waste of time to do sth.

D waste of time doing sth

D。it是形式主语,saying that again is a waste of time

C、 TO SAY
IT'S TIME TO DO STH, 这是一个句型

D 动名词做真正的主语