___certain doubt among the student as to the necessity of th

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___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.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 th _a certain doubt among the students as to the necessity of t ________a certain doubt among the people as to the practical _______a certain doubt among the people as to the practical -------a certain doubt among the students as to the necessit _______a certain doubt among the students as to the necessit ---There existed----a certain doubt among the students as to _______ a certain doubt among to the students as to the nece There remains a certain doubt among the people as to the pra _______ a certain doubt among the people as to the practical _____ a certain doubt among the people as to the practical v 英语从句题1._____a certain doubt among the people as to the pract