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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