How long does it take to get to school on foot?Marry wants to know.合并为一句

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How long does it take to get to school on foot?Marry wants to know.合并为一句

Marry wants to know that how long it takes to get to school on foot我的绝对正确请仔细辨别没有that??加了that这句更地道,如果要求不能加,去掉that句子照样正确