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精英家教網 > 高中英語 > 題目詳情

________ scores of times, but Derek still couldn't understand how to use past participle in a concrete situation.


  1. A.
    Having explained
  2. B.
    Having been explained
  3. C.
    Though it was explained
  4. D.
    It was explained
D
解析:
因為有連詞but,前面應是完整的句子,排除A,B; Though不能和but同時使用,所以選D。
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