_________ we must do is _________ the use of energy．


  1. A.
    That; to reduce
  2. B.
    How; to reduce
  3. C.
    What; reduce
  4. D.
    That; reduce
C
解析：
what引導(dǎo)主語(yǔ)從句，作do的賓語(yǔ)；
因主語(yǔ)從句中謂語(yǔ)動(dòng)詞為do，則不定式作表語(yǔ)時(shí)可省略to。
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