单选题 He keeps learning new teaching methods in order to ＿＿＿＿＿＿＿ for a teaching post. 的答案

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题目内容：
He keeps learning new teaching methods in order to ＿＿＿＿＿＿＿ for a teaching post.
题目选项
quantify
qualify
call
blow

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