单选题 Tom was surprised to know that Asia is ＿＿＿＿＿＿＿＿ as Europe. 的答案

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题目内容：
Tom was surprised to know that Asia is ＿＿＿＿＿＿＿＿ as Europe.
题目选项

four times large

as large four times