问题补充:
the police know the killers identity, they are getting close to catching him.
A. Even if
B. Although
C. Now that
D. As long as
答案:
A. Even if
B. Although
(答案→)C. Now that
D. As long as
解析:根据语境they are getting close to catching him可知应该用Now that。句子意思是“警方既已掌握了这名杀手的身份,要将他逮捕归案也就指日可待了。”