问题
单项选择题
It was believed that things would get worse, but（）it is they are getting better.
A. before
B. after
C. because
D. as
答案
参考答案：D
解析：
本题要求考生会分析语意。本题联系到省略：but as it is going now, they are getting better (这和前面提出的would get worse作意义比较)。故选D。