why did ______ take Mary an hour to get home yesterday afternoon?画横线的地方填什么单词

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why did ______ take Mary an hour to get home yesterday afternoon?画横线的地方填什么单词
why did ______ take Mary an hour to get home yesterday afternoon?画横线的地方填什么单词

why did ______ take Mary an hour to get home yesterday afternoon?画横线的地方填什么单词
it
why did ______ take Mary an hour to get home yesterday afternoon

填it,作形式主语。