問題詳情
3. For centuries large communities of people ____ on houseboats in parts of the world where the climate is warm and thewaters are calm.
(A) have been living
(B) could have lived
(C) might have been living
(D) have living
(E) have been lived
參考答案
答案：A
難度：困難0.2
統計：A(1),B(0),C(0),D(1),E(1)