Although the police thought he was the most likely one, _____ they had no exact proof about it, they could not arrest him.
A．whenB．untilC．beforeD．since
D
考查連詞.   A.當……時候B.直到…… C.在……以前    D.因為；由于；自……以來。句意：盡管警察認為他是最可能的一個，由于他們沒有確切的證據(jù)，他們也不能逮捕他。選D。
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