【題目】如果有必要，我可以提前通知他們你到達(dá)的時間。
, I can them your arrival time in advance.

【答案】If；necessary；inform；of
【解析】如果必要If necessary，這是一個省略句；inform sb of sth.告知某人某事，可知答案為If necessary, inform of。

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