She cannot but find a reasonable excuse for her being late.

她不得不给自己的迟到找一个合理的借口。

youdao

Can you give me a reasonable excuse for your being so late?

你能就你的迟到给我一个合理的解释吗？

youdao

The spokesman added that failure to apply for a new identity card within the specified call-up periods without reasonable excuse was an offence.

发言人补充，任何人士如无合理辩解而未能在指定换证限期内换领新身份证，即属违法。

youdao

Some penalties might be waived on proof of a reasonable excuse, such as a family illness.

BBC: Tax penalties of ?1,200 sent out by HMRC

One of the byelaws prohibits "people climbing on any wall, fence, tree, barrier, railing or structure without a reasonable excuse".

BBC: New laws to combat 'tombstoning' in East Yorkshire

Mr Bryant-Heron said Ms Casburn admits making the phonecall but denies asking for money, and says she had a reasonable excuse.

BBC: Detective April Casburn 'offered NoW leaks for cash'