Electric current can be transmitted from the power station to where _______.


  1. A.
    needed
  2. B.
    is needed
  3. C.
    needs it
  4. D.
    it is needing
A
解析：
句中where引導(dǎo)的是賓語(yǔ)從句，此空填needed，其前省略了it is，it代替Electric current.因從句主語(yǔ)是謂語(yǔ)動(dòng)詞動(dòng)作的承受者，從句應(yīng)用被動(dòng)語(yǔ)態(tài).從句中省略了與主句相同的主語(yǔ)和be動(dòng)詞，只剩下構(gòu)成被動(dòng)語(yǔ)態(tài)的過去分詞.C、D項(xiàng)是主動(dòng)語(yǔ)態(tài)，與句意不符.這句意思是“電流能夠從電站被輸送到所需要的地方”.答案為A.
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