Thisproblemissaid_____threetim

发布时间：2020-07-28 17:45:00

This problem is said _____ three timesA.to have been talkedB.to have discussedC.having been discussedD.to have been talked about

网友回答

D解析此处使用的是不定式的完成被动式。表示“曾经被讨论过三次”。
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