I would appreciate _________if you could let me know in advance whether or not you will be coming.  
A．itB．youC．thisD．that
A 
it指代if從句所表述的內(nèi)容。句意為：如果你提前讓我知道你是否會(huì)來(lái)，我會(huì)非常感激的。
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