题文
They had great difficulty ____ the people ____ in the fire.
| A．in rescue, trapping | B．to rescue, trapped |
| C．in rescuing, who trapping | D．rescuing, trapped |
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They had great difficulty ____ the people ____ in the fire.
| A．in rescue, trapping | B．to rescue, trapped |
| C．in rescuing, who trapping | D．rescuing, trapped |
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