This ____ （cure） your cough if you had taken it. 为什么答案要填could have cured?
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This ____ （cure） your cough if you had taken it. 为什么答案要填could have cured?
This ____ （cure） your cough if you had taken it. 为什么答案要填could have cured?
This ____ （cure） your cough if you had taken it. 为什么答案要填could have cured?
If 从句中 用了 had taken 是过去完成
主句与过去事实相反 主句用have done
翻译 如果你原先吃了它（药）那么你的咳嗽早就被治好了.
could have done something 表虚拟语气，与事实相反。
例1：This could have cured your cough if you had taken it. 如果你吃了这药的话，它已经治好你的咳嗽了。（事实是你没有吃药，你咳嗽没好。）
例2：I could not have made it without your help. 没你帮忙我不可能成功...
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could have done something 表虚拟语气，与事实相反。
例1：This could have cured your cough if you had taken it. 如果你吃了这药的话，它已经治好你的咳嗽了。（事实是你没有吃药，你咳嗽没好。）
例2：I could not have made it without your help. 没你帮忙我不可能成功的。（事实是你帮了我，我已经成功了。）
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虚拟语气，与过去事实相反。
如果你要是服用这个药的话，它可能就治好了你的咳嗽。
因为这个句子整个是假设的形态，所以不能添过去，现在，这能填将来，或者是假设，所以“could have cured"的意思是”可以治疗“ 。