The scientists ______ the mystery of the double helix, the scope for genetic eng

游客2025-03-20 4

问题 The scientists ______ the mystery of the double helix, the scope for genetic engineering dramatically increased.

选项 A、having solved
B、after being solved
C、solving
D、solved

答案 A

解析用分词的完成式表示solve发生在increase之前。如果选D，句子则应有表示时间的连词。

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