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Luckily, _______ happened to be no one in the building when the terrible fire broke out.

A. there
B. it
C. this
D. that
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科目：高中英語 來源：安徽省同步題 題型：單選題

Luckily, _______ happened to be no one in the building when the terrible fire broke out.
[     ]
A. there
B. it
C. this
D. that

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