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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