It was his job to repair bicycles and at that time he used to work fourteen hours a day.

It was his job to repair bicycles and at that time he used to work fourteen hours a day.

题目
It was his job to repair bicycles and at that time he used to work fourteen hours a day.
为什么用it was ...这种句型,
答案
这是形式主语,it做形式主语,真正的主语是to repair bicycles
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