問題詳情
34. Since 1776, a variety of treaties, purchases, wars, and Acts of Congress ___________ the territory of theUnited States to what we know today.
(A) has extended
(B) extended
(C) have extended
(D)had extended
參考答案
答案：C
難度：困難0.333333
統計：A(12),B(6),C(22),D(23),E(0)