Reports showed that it was not the first time this state-owned firm ________ serious accidents.


  1. A.
    has happened
  2. B.
    had happened
  3. C.
    has experienced
  4. D.
    had experienced
D
解析:根據(jù)固定句型It is/was the first time that…h(huán)as/had done sth.判斷,排除A、C;happen為不及物動詞,后不接賓語;experience(經(jīng)歷)為及物動詞,后接賓語。故選D.
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