Question

---How long has the United Nations ________? --- ______1945. A．come into existence; In B．be.

---How long has the United Nations ________? --- ______1945. A．come into existence; In B．been in existence; Since C．been in existence; From D．come into existence; For

Answer 1

B

这题考查动词的用法：因为和how long连用，要表示状态的动词be in existence，come into existence是短暂动词，不能和表示一段时间连用，第二空填since，可以和现在完成时连用。选B。