Select the most appropriate option to fill in the blank.
The air quality is so bad ______it becomes difficult to breathe.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. that.
- "That" is the most appropriate option because it correctly introduces the result clause, indicating the effect of the bad air quality.
- The structure "so...that" is used to show how something leads to a particular outcome or consequence.
- "When" and "as" refer to time or condition, while "since" typically indicates cause, not result. Therefore, "that" effectively connects the severity of the air quality to the difficulty in breathing.