单选题 It ＿＿＿＿＿＿＿＿＿＿ us years to find out that Father loved us very much, because it was so hard for him to express it. 的答案

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题目内容：
It ＿＿＿＿＿＿＿＿＿＿ us years to find out that Father loved us very much, because it was so hard for him to express it.
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