The accident is ________ reminder of the potential dangers involved in ________ oil production in this area.
| A．a; the | B．the; / | C．the; the | D．/; a |
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The accident is ________ reminder of the potential dangers involved in ________ oil production in this area.
| A．a; the | B．the; / | C．the; the | D．/; a |
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