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It,s a waste of time____him.He is not longer in charge now.A

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It,s a waste of time____him.He is not longer in charge now.A.asking B.to ask C.asked D.asks
具体的思路是什么,答案说选A,为什么?B不行吗
It,s a waste of time____him.He is not longer in charge now.A
It is a waste of time doing sth做某事简直就是浪费时间,of是介词,后面接动词Ing形式.且Of和To是不能连用的故B错.
再问: 还有动词的过去分词可不可以作宾语 Few houses in the village were left standing after the earthquake.中left是不是做宾语啊?如果不是拿什么作宾语??