2. 外语
  3. My teacher used to (courage) ______ us to answer his questions voluntarily.

My teacher used to (courage) ______ us to answer his questions voluntarily.

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问题 My teacher used to (courage) ______ us to answer his questions voluntarily.
选项
答案encourage
解析 此处考查固定短语used to do sth．，表示“过去常常做某事”，所以填入动词原形。同时要注意区别另外一个固定短语be used to doing sth。意为“习惯做某事”，而这里的to是介词，后面要用动名词形式，所以不能用动词原形。
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