_______ the boy was walking down the street, the UFO landed.A．WhileB．AfterC．Befo
题型：不详难度：来源：
_______ the boy was walking down the street, the UFO landed.| A．While | B．After | C．Before | D．until |
|
答案
| A |
解析
试题分析：句意：当这位男孩在街道上散步时，UFO着陆。While当……的时候；after在···……之后；before在……之前；until直到。所以选A。 |
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