As you know, there are a few formalities to be before you enter a foreign country. A. gon

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(答案→)A. gone through
B. gone against
C. gone over
D. gone up
解析：go through意为“获准；经过程序”；go against意为“违反”；go over意为“复习”；go up意为“上升”。句意为：正如你所知，你进入外国之前要办一些正式手续。