语法与词汇 Although the scientists have made great progress in their research, there are still a large amount of calculation remain________.

【正确答案】 D

【答案解析】句意：尽管科学家们的研究取得了很大进展，但仍有大量计算任务尚未完成。remain to be done表示有待要做的事情，动作尚未发生，如：A lot of machines remained to be repaired （机器尚未修理）。