Choose the option that best completes the gap. Mrs. Okoro __________ in this school since 1975
- taught
-
has been teaching
- was teaching
- is teaching
The correct answer is: B
Explanation
'Since' implies from a specified time in the past. A present perfect progressive tense describes an event in a progressive form that started in the past and ended in the present. 'has been teaching' is an example of a verb element associated with a present perfect progressive tense
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