다음 중 어법에 맞는 표현으로 가장 적절하지 않은 것은?
If technology produced automobiles ㉠that pollute the air, it is because pollution was not ㉡recognized as a problem ㉢what engineers had to consider ㉣in their designs. ① ㉠     ② ㉡     ③ ㉢      ④ ㉣

모르면 교정컷 250점 주장해라