You know there are hundreds of reports of reports of people who claim __UFOsA.to see B.seeing C.to have seen D.having seen

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You know there are hundreds of reports of reports of people who claim __UFOsA.to see B.seeing C.to have seen D.having seen

You know there are hundreds of reports of reports of people who claim __UFOsA.to see B.seeing C.to have seen D.having seen
You know there are hundreds of reports of reports of people who claim __UFOs
A.to see B.seeing C.to have seen D.having seen

You know there are hundreds of reports of reports of people who claim __UFOsA.to see B.seeing C.to have seen D.having seen
这里claim意思是宣称,声称 后面接不定式.排除D B
选C
声称曾经看过UFO(飞碟;不明飞行物),用现在完成时.
选A的话就表示经常性的动作 显然不对哈
请选择为“满意答案”~

选c claim to do 声称做某事 用have seen因为这是一个之前发生的动作

B