The new China was founded in 1949, ______ great changes have taken place


  1. A.
    since when
  2. B.
    after which
  3. C.
    in which
  4. D.
    when
A
考查定語從句。句意:新中國在1949 年建立,從那時候起中國就發(fā)生了重大變化,F(xiàn)行詞為1949,,從句中缺少時間狀語從句。所以選A。
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