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.
___certain doubt among the student as to the necessity of the work A.they existed B.there existing
___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
C.thereexisted D.IT exist 选什么 喂什么BD不可以
英语人气：501 ℃时间：2019-11-21 10:48:56
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