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A
firstly
B
at first
C
first
D
early
正确答案 :C
解析
[考点]词义辨析题 【精析】Cfirstly:首先;at first:首先,起初;first:最初,最早;early:提早,在早期。根据句意可知,这里指的是在白宫最初建造之时。故选C。
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