兩題英文請幫翻譯解題分析文法解釋 - 社會議題

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1. _____been for the Norman invasion of 1066, the vocabulary of English might have remained much closer to that of its Germanic relatives.
(A) If not (B) Were it not (C) Had it not (D) Unless it had
2. According to some scientists, deforestation is a serious problem which,_____ it remain unsolved, will bring about a significant increase in global warming.
(A) would (B) if (C) unless (D) should
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