Perhaps even more important than the accuracy and

Perhaps even more important than the accuracy and reliability of a meteorological instrument________.
A. that positioning it is correct
B. is positioned correctly
C. that its correct position
D. is that it be positioned correctly
答案为D，求解释与句法分析。

前面整体是主语部分，所以需要个谓语和表语部分，D答案刚好符合that引导表语从句。 题干缺主谓,that 代指 meteorological instrument(气象工具),应用被动语态

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