单选题 If it ＿＿＿＿＿＿＿＿＿＿ yesterday afternoon, I would have gone fishing. 的答案

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题目内容：
If it ＿＿＿＿＿＿＿＿＿＿ yesterday afternoon, I would have gone fishing.
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