[احمد عبد السميع]

that's true it depens
but as the number is mentioned without using one of the tense indicators of the past
it's better to use the present perfect
thanks for replying
by i the way
i went through all the units in the book and found the sentence
present prefec in the teacher's guide
so the Bazzar book made a mistake
i know it's unintended
but i was eally confused epecially in nowadays before the exam
not only i but also every teacher needs a decisive answer
again thank you Mr Mustafa t