Students should (strength)______their sense of self-confidence.

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问题 Students should (strength)______their sense of self-confidence.

选项

答案strengthen

解析 分析句子结构,本句缺少谓语动词。而本句中情态动词should后也应用动词原形,所以用名词strength的动词形式,即在后面加后缀一en构成strengthen。
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