Some green beans, ______ long enough, can be poisonous (有毒的).
| A．if not be cooked | B．if not cooked | C．if not cooking | D．if not being cooked |
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Some green beans, ______ long enough, can be poisonous (有毒的).
| A．if not be cooked | B．if not cooked | C．if not cooking | D．if not being cooked |
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