Small sailboats can easily turn over in the water ________.
| A．if not managed carefully | B．if are not managed carefully |
| C．unless not managed carefully | D．unless are not managed carefully |
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Small sailboats can easily turn over in the water ________.
| A．if not managed carefully | B．if are not managed carefully |
| C．unless not managed carefully | D．unless are not managed carefully |
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