When using (to be taught), should it be (was taught) or (has been taught)?
For example:
He taught her Russian, in other words, she _____ Russian.
- has been taught
- has taught
- taught
- was taught
And why?
When using (to be taught), should it be (was taught) or (has been taught)?
For example:
He taught her Russian, in other words, she _____ Russian.
- has been taught
- has taught
- taught
- was taught
And why?
In real life, both (1) and (4) are grammatically correct, as Peter Shor commented. Which one you choose depends on what you want to emphasize the present or the past respectively.
For the purpose of the exercise, since the active voice is a simple past tense, a straightforward conversion to the passive would yield (4), which I believe is meant to be the "correct" answer.