______a certain doubt among the people as to the practical value of the project.

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问题 ______a certain doubt among the people as to the practical value of the project.

选项 A、It has
B、They have
C、It remains
D、There remains

答案D

解析 there remains=there is…,是there be结构的一种变体,表示“在……还有/依然有……”。句意:关于这项工程的实用价值,这些人中存在着一个疑惑。
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