Premise: Using virtual classroom, teachers surveyed claim that they can make points and verify the points have beenunderstood.
Conclusion: This business has a promising future.
"unless" before the blank indicates that a weakener is needed.
Pre-thinking: We need a disadvantage of virtual classroom that prevents teachers from delivering and getting their points acknowledged.
Moving on to 5 options:
A. the teachers mentioned in the passage do not realise that on a lecture video the students
...
Conclusion: This business has a promising future.
"unless" before the blank indicates that a weakener is needed.
Pre-thinking: We need a disadvantage of virtual classroom that prevents teachers from delivering and getting their points acknowledged.
Moving on to 5 options:
A. the teachers mentioned in the passage do not realise that on a lecture video the students
...
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