The antecedent is plural, so use "they".
Student or Learner
I am not sure whether the sentence below is grammatically correct or not.
What should I use "they have become" or "it has become". (I think "it has become" is correct)
Does the entire sentnce sound natural to your native speakers ears?
Since a large number of high-tech devices such as computers, laptops, smartphones and the modern internet appeared, they have become / it has become an integral part of any business.
Thanks in advance.
Please, correct all my mistakes. I should know English perfectly and if you show me my mistakes I will achieve my dream a little bit faster. A lot of thanks.
Not a teacher nor a native speaker.
The use of "a large number of" confuses many students because it appears to be singular. However, if there is a large number of something, there must be more than one so the plural is appropriate.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.