The effect of the medicine on this kind of disease remains ________.
A．seenB．to be seenC．seeingD．to see
B
句意：這種藥對這種疾病的效果尚待觀察。由題意可知，remain在此是用作系動詞，且see這一動作還沒有發(fā)生，答案鎖定在B和D中間；“the effect”和“see”之間存在邏輯上的被動關(guān)系。
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