There have been many changes ________ in my hometown in the last twenty years.


  1. A.
    happen
  2. B.
    happened
  3. C.
    happening
  4. D.
    to happen
C
解析：這個句子的意思很明顯：在最近的二十年的時間里，我的家鄉(xiāng)發(fā)生了很多變化。這是個there be句型，been是這個句子的謂語動詞，故happen應(yīng)該使用非謂語形式。由于happen是不及物動詞，故只能使用其ing形式。因此本題正確答案為C。
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