42 Do you know that the largest United States Air Force _____ in the Pacific is on Okinawa？
(A) foundation
(B) base
(C) condominium
(D) flat

Do you know that the largest United States Air Force base in the Pacific is on Okinawa？
你知道美國在太平洋最大的空軍基地就在沖繩嗎？

base(noun)
the bottom part of an object, on which it rests, or the lowest part of something
基底，底座；底層，底部
the main place where a person lives and works, or a place that a company does business from
基地;總部
the activity or people from which someone or something gets most of their support, money, etc.
基礎，支柱
the main part of something
主要成分

foundation
an occasion when an organization, state, etc. is established
創建;建立
condominium
an apartment building in which each apartment is owned separately by the people living in it, but also containing shared areas
公寓大樓
flat
level and smooth, with no curved, high, or hollow parts
水平的；平坦的