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混合条件句
情景 · Scenario：
表达“与过去事实相反，影响现在”。
Expressing "contrary to past fact, affecting the present".
点击右侧喇叭可朗读整段对话，点击每句话旁的小喇叭可单句跟读。
if 用过去完成（与过去相反），主句用 would + 原形（影响现在）：If I had studied, I would know it now.
If-clause in past perfect (contrary to past), main clause would + base (present result): If I had studied, I would know it now.
“如果当初签了合同，现在就有保障了” 正确说法是？