【題目】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

【答案】B

【解析】

試題分析：句意：如今中國行人面臨著一種奇怪、新的困境：該不該幫助摔倒在馬路上的老人？此處指已經(jīng)摔倒在地的老人，強調(diào)完成，應該用現(xiàn)在完成時，故選B。

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