【題目】I'd appreciate if you could let me know in advance whether or not you will come.

【答案】it
【解析】句意：如果你能讓我提前知道你是否回來(lái)我將不勝感激�！啊瓀ould appreciate it if…”是固定句型，it作形式賓語(yǔ)。故填it。

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