【題目】是否出國留學值得三思。

Whether to study abroad _______.

【答案】is worth thinking twice

【解析】

結合中文句意，值得做某事用“be worth doing sth”；三思用“think twice”，這里是疑問詞+ 不定式作主語，謂語動詞應該用三單形式，故答案為is worth thinking twice。

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