答案A． it指代if从句所表述的内容，是充当形式宾语．真正的宾语是：if you could let me know in advance whether or not you will come. I'd appreciate it if…属于固定句式，表示"假如…我将不胜感激"． 故选：A。
[点评]
考查代词辨析及语境理解．appreciate后跟接if或when从句时，其后不直接跟if或when引导的从句，若语义上需要接这类从句，需借助it.如：I would appreciate it very much if you would help me with it.如果你能帮助我做这事，我会十分感激．We really appreciate it when she offered to help.她来帮忙了，我们十分感激．
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