C.There existed 是的
there exist=there be,有著,存在的意思.B錯在existing不對,不能用分詞,因為要做謂語；D.IT exist 錯在沒有這樣的用法.
___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 選什么 喂什么BD不可以
C.thereexisted D.IT exist 選什么 喂什么BD不可以
英語人氣：196 ℃時間：2019-11-21 10:48:56
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