Nowadays a strange, new dilemma faces Chinese pedestrians: should you help an elderly person who ________ into the street?
| A．is falling | B．has fallen |
| C．had fallen | D．was falling |
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Nowadays a strange, new dilemma faces Chinese pedestrians: should you help an elderly person who ________ into the street?
| A．is falling | B．has fallen |
| C．had fallen | D．was falling |
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