问题补充：
At a rough estimate .Nigeria is Great Britain.
A. three times the size as
B. the size three times of
C. three times as the size of
D. three times the size of
答案：
A. three times the size as
B. the size three times of
C. three times as the size of
(答案→)D. three times the size of
解析：表示倍数或者百分比的表达方式有：
1) …倍数/百分比+形容词或者副词比较级+than…
2) …倍数/百分比+the+名词（size/width/wight/height/length/etc_）+of…
3) …倍数/百分比+as+形容词或者副词…+…
4)倍数/百分比+可数名词复数+…
5)倍数/百分比+不可数名词+…
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