题目内容
【题目】While the boy down the street, the UFO landed.
A. had walked B. was walking C. has walked D. is walking
【答案】B
【解析】
句意“当这个小男孩走在路上时,UFO登录了”。本题考查时态,根据句意可知,指UFO着陆时,这个小男孩正在路上走,且根据landed可知,用过去进行时,故选B。

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题目内容
【题目】While the boy down the street, the UFO landed.
A. had walked B. was walking C. has walked D. is walking
【答案】B
【解析】
句意“当这个小男孩走在路上时,UFO登录了”。本题考查时态,根据句意可知,指UFO着陆时,这个小男孩正在路上走,且根据landed可知,用过去进行时,故选B。