________，they found that he was gradually recoveringA.To their much delightB.To much delightC.To much their delightD.Much to their delight
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D解析试题分析：句意：更让他们高兴的是，他们发现他正在渐渐恢复。To one’s delight令人感到高兴的是，much是程度副词，放在这个短语前起修饰作用,这个短语中的物主代词与句子的主语保持一致，根据句意故选D。考点：考查固定搭配。