问题补充：
Our town has been added to these years. It is no longer it was 15 years ago, it was poor and untidy.
A. what; which
B. that; which
C. which; that
D. what; when
答案：
A. what; which
B. that; which
C. which; that
(答案→)D. what; when
解析：主要测试表语从句。前句—的样子用what，后句为定语从句用which。译文：这些年我们的城市强大了。它已经不再是十五年前即穷又不干净的样子了。
