问题
选择题
Corruption is _______ problem in countries across the world, with developing countries often believed to be more serious, although there is no evidence to suggest this is _______case.
A．a; the
B．the; a
C．不填; the
D．a; a
答案
答案：A
题目分析：句意：腐败是一个全世界国家的问题，发展中国家被认为是更加严重，虽然没有证据表明情况是这样。第一空是泛指“一个问题”，第二空是特指上文的情况，所以选A。