2. 考研
  3. The fragrances of many natural substances come from oils, ______ these oils may be used in manufacturing perfumes.

The fragrances of many natural substances come from oils, ______ these oils may be used in manufacturing perfumes.

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问题 The fragrances of many natural substances come from oils, ______ these oils may be used in manufacturing perfumes.
选项 A、of
B、whether
C、from
D、and
答案D
解析 两个分句都不缺成分，所以没有主从之分，是两个并列的句子，应用连词连接。A、B、C都是介词，故选D，这里and表示递进关系。
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