◎ 题干
A tsunami (海啸) _____ in some southern Asian countries in December, 2004.
_____ homeless people had to stay in the open air.

[     ]

A. has happened; Thousands of
B. happened; Thousands of
C. has happened; About twelve thousand of
D. happened; Twelve thousands
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◎ 解析
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◎ 知识点
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