I would appreciate it _____ you call back this afternoon for the doctor's appointment.A,until B.if C.when D.that 请问应该选哪个?我怎么觉得BC都可以呢?

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I would appreciate it _____ you call back this afternoon for the doctor's appointment.A,until B.if C.when D.that 请问应该选哪个?我怎么觉得BC都可以呢?

I would appreciate it _____ you call back this afternoon for the doctor's appointment.A,until B.if C.when D.that 请问应该选哪个?我怎么觉得BC都可以呢?
I would appreciate it _____ you call back this afternoon for the doctor's appointment.
A,until B.if C.when D.that 请问应该选哪个?我怎么觉得BC都可以呢?

I would appreciate it _____ you call back this afternoon for the doctor's appointment.A,until B.if C.when D.that 请问应该选哪个?我怎么觉得BC都可以呢?
B
这是句型
I'd appreciate it very much if you could do sth,意思:如果你能做什么的话,我将不胜感激.

选项是A

答案选B. if
可以这么理
第一部分:I would appreciate it
第二部分:if you call back this afternoon for the doctor's appointment
第二部分不是第一部分的宾语或者定语(否则的话,有可能用that连接),两部分是并列的,也可以简单理解为一个 If ... , I will/ wou...

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答案选B. if
可以这么理
第一部分:I would appreciate it
第二部分:if you call back this afternoon for the doctor's appointment
第二部分不是第一部分的宾语或者定语(否则的话,有可能用that连接),两部分是并列的,也可以简单理解为一个 If ... , I will/ would ...“如果...,我就....”的条件结构,再比如:
I would be grateful if you could open it for me. 如果你能帮我打开的话,我会感激不尽。
It would be great if you could make it. 如果你能来的话,那就太好了。

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B,这是条件状语从句

B 一般虚拟语气句型

选B。C不合适, 因为I would 是个表示假设的语气,而when是当什么什么时候,难道说只有在你回电话的时候我才会感激,显然不合适。if是如果的意思,含有假设的语气。翻译:我将会很感激如果你今天下午为了医生的约会回电话给我。