_____ the police thought he was the most likely one, they could not arrest him since they had no exact proof about it. 
| A．Although | B．As long as | C．If only | D．As soon as |
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_____ the police thought he was the most likely one, they could not arrest him since they had no exact proof about it.
| A．Although | B．As long as | C．If only | D．As soon as |
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