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    【题目】__________ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.

    A. Although

    B. As long as

    C. If only

    D. As soon as

    【答案】A

    【解析】句意:虽然警察们认为他最有可能是罪犯，但因为没有确凿的证据，他们不能逮捕他。本句结构稍微复杂，可改为：Although the police thought he was the most likely one, they could not arrest him, since they had no exact proof about it. 这样可以看出，这是一个复合句，although引导让步状语从句，其余部分为主句，而这个主句又含since they had no exact proof about it. 这一原因状语从句。

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