题目内容

It takes about twelve minutes    and five minutes by bike.
A．walkingB．walkC．to walkD．walking
C

试题分析：本题的含义是步行需花费12分钟的时间，而骑自行车需要花费5分钟的时间，本题的主语it是形式主语，代替步行，真正的主语位于句尾，用动词不定式to walk，故本题选C。
点评：在英文中，当主语是动词短语或主语过长时，为了避免头重脚轻，通常主语用it代词，叫做形式主语，而真正的主语内容位于句尾，用动词不定式，使句子使用更加方便和美化。
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