問題詳情
21. Many modern skyscrapers, though visually pleasing, they have heating and cooling systems that require closed windows and consequently waste energy.
(A)visually pleasing
(B) they have
(C)closed
(D)waste
參考答案
答案：B
難度：適中0.412955
統計：A(39),B(102),C(37),D(49),E(0)
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