It takes about twelve minutes                and five minutes by bike.


  1. A.
    walking
  2. B.
    walk
  3. C.
    to walk
  4. D.
    walking
C
試題分析：本題的含義是步行需花費(fèi)12分鐘的時(shí)間，而騎自行車(chē)需要花費(fèi)5分鐘的時(shí)間，本題的主語(yǔ)it是形式主語(yǔ)，代替步行，真正的主語(yǔ)位于句尾，用動(dòng)詞不定式to walk，故本題選C。
考點(diǎn)：形式主語(yǔ)it和真正主語(yǔ)to do sth的使用。
點(diǎn)評(píng)：在英文中，當(dāng)主語(yǔ)是動(dòng)詞短語(yǔ)或主語(yǔ)過(guò)長(zhǎng)時(shí)，為了避免頭重腳輕，通常主語(yǔ)用it代詞，叫做形式主語(yǔ)，而真正的主語(yǔ)內(nèi)容位于句尾，用動(dòng)詞不定式，使句子使用更加方便和美化。
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