In many cities of China, if an ambulance is＿＿in a traffic jam, police will respond to the emergency.
| A．held up | B．held back |
| C．held down | D．held out |
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In many cities of China, if an ambulance is＿＿in a traffic jam, police will respond to the emergency.
| A．held up | B．held back |
| C．held down | D．held out |
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