29. 다음 글의 밑줄 친 부분 중, 어법상 틀린 것은? [3점] The renowned British philosopher Alfred North Whitehead asserted that “civilization advances by extending the number of operations we can perform without thinking about them.” Take, for example, the “advance” ① offered to civilization by the discount coupon, which allows consumers to assume that they will receive a reduced purchase price by presenting the cou..