_______ the boy was walking down the street, the UFO landed.
A．WhileB．AfterC．BeforeD．until
A

試題分析：句意：當(dāng)這位男孩在街道上散步時，UFO著陸。While當(dāng)……的時候；after在···……之后；before在……之前；until直到。所以選A。
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