My uncle says that it’s his duty _______

试题详情及答案解析: My uncle says that it’s his duty ________the patients.
A. save B. to save C. Saving; 答案：B; 试题分析：句意:我的叔叔说救治病人是他的职责。为了避免头重脚轻，在许多情况下，通常都将作主语的不定式置于句子后部，而在句首主语位置使用形式主语it。故选B。
考点：考查非谓语动词。