محتاج رأي حضراتكم في الجملة دي!!!

[almallah2010]

You are completely right, sir.
We do teach formal British English. Yet, it is now common knowledge that curriculum specialists are between US and Cairo all year long, so they have an undisputed inclination to use American English.
Personally, I stick to the origin and claim it is a mistake in the course book no matter what students may say in the future when other teachers say it is true on the american way.