It is a good plan in theory, but it _____ to be seen whether it works in practice.A.keepsB.staysC.standsD.remains
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D解析试题分析：考查动词：A. keeps保持，B. stays停留，C. stands站立D. remains仍然，句意：这在理论上是个好计划，但是否能在实践中起作用还有待证实。选D。考点：考查动词
点评：这里涉及到固定搭配it remains to be seen whether…，是否…还有待证实。要牢记。