______ a certain doubt among the students as to the necessity of the worD.
A.It existed
B.There existed
C.They had
D.There had

A.A.It
B.There
C.They
D.There

【参考答案】

B
解析：句意：对于这个单词的必要性，学生们存在着相当的疑惑。本题考查There be句型。There be句型......

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