---How long has the United Nations ________?
--- ______1945.
A．come into existence; InB．been in existence; Since
C．been in existence; FromD．come into existence; For
B
這題考查動詞的用法：因為和how long連用，要表示狀態(tài)的動詞be in existence，come into existence是短暫動詞，不能和表示一段時間連用，第二空填since，可以和現(xiàn)在完成時連用。選B。
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