想問第20題，為什麼不能用 that used to?
el is made? C. at Evg D. from 13. 21429 439 (ait, en way? Eftill not (16) that) reduced noise and nuo (18). making walls hollow by the _(20). 119 其中 II . Please choose the correct words to complete the following paragraph. Pomoc In the twentieth century, architects in large cities designed structures _(17)_ made it to the living as comfortable as possible.) They used such techniques and _(19)_ this wall space with materials that absorb noise. Thick carpets and heavý curtains pohy po D *t the cover floors and windows. Air conditioners and furnaces were designed to filter air through_(21). 10 materials. (22). after much time and effort that people also reacted adversely to the lack of sound. Now, 91 by undesirable noise but _(25)_ the kind of noise that people seem to need. 某種行式 by hit € 16. A. in a way C. such way B 17. 4. to B. for D. but 18. A. that B. as C. to D. let 自由 19. A. taking B. sending C. forming D. filling 20. A. used to B. that used to C. was used to 37 D proof (23)_ in making buildings less noisy, it was discovered (24)__ are designing structures that reduce Tunt et D. in thus way by 18. IB) such ni asini a B. a way C. yet EX FL | Alib qut Da D. were used to TO