It is Mrs Garrowby who locks up the front of the house, anyhow'.

无论如何，是加洛比太太把房子的前门锁上了。

She had come in about ten; or later, perhaps: she had strolled home because it was a lovely night; and had locked up the front of the house.

她大约十点钟进来了； 或者晚些时候， 也许：她散步回家是因为那是一个美好的夜晚； 并锁上了房子的前面。