問題詳情
【題組】47. If you want to use energy free, you have to_____.
(A) sign an agreement with the government
(B) pay around £14,000 for the equipment
(C) sell the roof to some energy companies
(D) keep the roof unchanged for within 25 years
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)