Every possible means ________, but none proves successful．


  1. A.
    has tried
  2. B.
    has been tried
  3. C.
    have been tried
  4. D.
    tried
B
“每一個(gè)可能的方法都已經(jīng)試過了，但沒有一個(gè)成功的�！比羧サ鬮ut，也可以選擇D項(xiàng)，讓逗號(hào)前作獨(dú)立主格，為主句做狀語(yǔ)。
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