___certain doubt among the student as to the necessity of the work A.they existed B.there existingC.thereexisted D.IT exist 选什么喂什么BD不可以

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___certain doubt among the student as to the necessity of the work A.they existed B.there existingC.thereexisted D.IT exist 选什么喂什么BD不可以
___certain doubt among the student as to the necessity of the work A.they existed B.there existing
C.thereexisted D.IT exist 选什么喂什么BD不可以

___certain doubt among the student as to the necessity of the work A.they existed B.there existingC.thereexisted D.IT exist 选什么喂什么BD不可以
C.There existed 是的
there exist=there be,有着,存在的意思.B错在existing不对,不能用分词,因为要做谓语；D.IT exist 错在没有这样的用法.

因为它们是错误选项

___certain doubt among the student as to the necessity of the work A.they existed B.there existingC.thereexisted D.IT exist 选什么喂什么BD不可以 te amo Amo是什么意思? 素颜 Amo Te Amo,Te Amo 歌词 Ti Amo (Ti Amo) 歌词 Ti amo和Ti amo的区别 beyond doubt doubt 用法 doubt咋读 doubt翻译 doubt about和doubt of doubt about和doubt of te amo te 西班牙语 te'amo te amo,mi amor TI AMO X SEMPRE Ti amo Te Quiero

___certain doubt among the student as to the necessity of the work A.they existed B.there existingC.thereexisted D.IT exist 选什么 喂什么BD不可以

___certain doubt among the student as to the necessity of the work A.they existed B.there existingC.thereexisted D.IT exist 选什么喂什么BD不可以