When ________ to a high enough temperature water can change into vapour.


  1. A.
    heating
  2. B.
    being heated
  3. C.
    heated
  4. D.
    having heated
C
題意“當(dāng)被加熱到一個(gè)足夠高的溫度時(shí)，水會(huì)變成氣體。”這是一個(gè)省略了的狀語從句，原句應(yīng)是When water is heated to a high temperature, when引導(dǎo)的狀語從句可省略主語和系動(dòng)詞be.
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