________ 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 |
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________ 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 |
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