试题题干
（ ） the police thought he was the most likely one, they could not arrest him since they had no exact proof about it.
参考答案
正确答案：
试题解析
although——尽管，虽然；as long as——只要；if only——但愿；as soon as——一…就。结合句意可以确定表示“尽管”的although最符合句意，故选A。
句意：虽然警察认为他是最有可能的人，但由于没有确切的证据，他们不能逮捕他。