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

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

admin2014-09-24  36
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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