When _______, water will be turned i

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When _______, water will be turned into steam.

  • A.heated
  • B.heating
  • C.being heat
  • D.having heated

参考答案:

A

水被加热时会变成蒸汽。因为主句主语 water 和从句谓语 heat 的关系是被动的,所以用过去分词。