单选题 ＿＿＿＿＿＿＿＿＿ the child expresses his interest in an activity, the stronger his interest will become. 的答案

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题目内容：
＿＿＿＿＿＿＿＿＿ the child expresses his interest in an activity, the stronger his interest will become.
题目选项

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