simple past or present perfect? which one and why?
In this sentence which tense should be used and why?

They ................ (to convert) to Islam between the years 639 and 643 AD.

a) have converted
b) converted

Question

simple past or present perfect? which one and why?
In this sentence which tense should be used and why?

They ................ (to convert) to Islam between the years 639 and 643 AD.

a) have converted
b) converted

Answer

You're given times in the past, so use past tense.