i would have called you ( )A if i kenw your telephone numberB but i had forgotten your telephone numberCbut i forgot your telephone numberDif i had remember your telephone number这道题为什么选C呢?

i would have called you ( )A if i kenw your telephone numberB but i had forgotten your telephone numberCbut i forgot your telephone numberDif i had remember your telephone number这道题为什么选C呢?
i would have called you ( )
A if i kenw your telephone number
B but i had forgotten your telephone number
Cbut i forgot your telephone number
Dif i had remember your telephone number
这道题为什么选C呢?

i would have called you ( )A if i kenw your telephone numberB but i had forgotten your telephone numberCbut i forgot your telephone numberDif i had remember your telephone number这道题为什么选C呢?
答案：C（如果D是if I had remembered your telephone number,则D也正确）
此题考查虚拟语气.
1.I would have called you意思是“我（在过去的某个时候）本来就会打电话给你”,隐含对过去动作的虚拟,即过去的实际情况是“我没有给你打电话”.
2.C用了but,即阐述过去当时的实际情况,所以用一般过去时,为正解.
3.如果用if引导的条件状语从句,则if从句也表示对过去动作的虚拟“如果我（当时）记得你的电话号码的话”.
则根据虚拟语气的语法,if从句使用过去完成时,所以说如果D是if I had remembered...的话,则也是正确答案.此时主句的谓语动词使用“would/could/might/should + have done sth”,也符合题中的I would have called you.

翻译：我会给你打电话的，但我忘了你的电话号码
这是一个 与过去事实相反 的 虚拟语气
从句：If 主语+had+done 　　
主句：主语+should/would/could/might+have done
选项中带有if的句子不符合这个结构，所以只能换一种说法
A 应改为 if i had known your telephone number
...

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翻译：我会给你打电话的，但我忘了你的电话号码
这是一个 与过去事实相反 的 虚拟语气
从句：If 主语+had+done 　　
主句：主语+should/would/could/might+have done
选项中带有if的句子不符合这个结构，所以只能换一种说法
A 应改为 if i had known your telephone number
D 应改为 if i had remembered your telephone number
不明白的话，欢迎继续追问O(∩_∩)O

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would have，虚拟语气标志，意思是我本该call你，但是我没call,那么后面肯定是分析为什么没call,排除a,d ,看b,d.然后就有点难说了，这个是错综虚拟，应该选c，

Cbut i forgot your telephone number
因为前一句i would have called you 是虚拟句，表示对过去的虚拟。意思是“我过去本可以给你打电话但愿是我忘记了你的电话号码”。前一句的过去表示后一句的动作“忘记”也发生在过去。所以用过去时。
A if i kenw your telephone number也是虚拟。表示如果现在我知道你的电...

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Cbut i forgot your telephone number
因为前一句i would have called you 是虚拟句，表示对过去的虚拟。意思是“我过去本可以给你打电话但愿是我忘记了你的电话号码”。前一句的过去表示后一句的动作“忘记”也发生在过去。所以用过去时。
A if i kenw your telephone number也是虚拟。表示如果现在我知道你的电话号码。显然与前一句不符。
B but i had forgotten your telephone number表示过去的过去，也不符。
Dif i had remember your telephone number也不符。

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题目中的话是虚拟语气,是对过去的虚拟,如果选if引导的从句,从句应用过去完成时,如果是并列句用过去时.只有C正确

“我原本想要打给你。。。。。。”
虚拟语气表示“本要。。。（却没有。。。）”时，用would have done