As a rough estimate, Nigeria is Great Britain.
A. three times the sizes as
B. the size three times of
C. three times as the size of
D. three times the size of
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A. three times the sizes as
B. the size three times of
C. three times as the size of
(答案→)D. three times the size of
解析：考察倍数表达法。倍数表达有四种：1. “A+倍数+形容词或副词的比较级+than+B”， 2.“A+倍数+as+形容词或副词的原级+as+B”， 3. “A+倍数+the size/height/length/width， etc+of+B”， 4. “……times+what+从句”。这四种方式指都把倍数放在了最前面，本题考察的是第三种。句意：粗略估计，尼日利亚是英国的3倍大。故D正确。