is no good without doing anything.A. This, talkingB. It, to talkC. It, talkingD. That, t

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A. This, talking
B. It, to talk
(答案→)C. It, talking
D. That, to talk
解析：　本题用的是句型：It is no good doing sth. 意思是“干…没用/好处”其中it 作形式主语，用来代替后面的动名词短语。