答案：A
例句：
We would appreciate it if you could offer us any help .
如果您能为我们提供帮助的话,我们将不甚感激
I appreciate it if it could be arranged.
如果你们能安排,我将不胜感激.
We appreciate it if you can cooperate with us.
如果贵方能与我方合作,不胜感激.