题目内容

The effect of the medicine on this kind of disease remains ________.
A．seenB．to be seenC．seeingD．to see
B
句意：这种药对这种疾病的效果尚待观察。由题意可知，remain在此是用作系动词，且see这一动作还没有发生，答案锁定在B和D中间；“the effect”和“see”之间存在逻辑上的被动关系。
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