问题描述：
________a certain doubt among the people as to the practical value of the project.A．It has
________a certain doubt among the people as to the practical value of the project.
A．It has B．They have
C．It remains D．There remains
________a certain doubt among the people as to the practical value of the project.
A．It has B．They have
C．It remains D．There remains
问题解答：
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