2. 外语
  3. In the first decades of the twentieth century, the individual gene could not be seen, but could be worked with fruitfully.

In the first decades of the twentieth century, the individual gene could not be seen, but could be worked with fruitfully.

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问题 In the first decades of the twentieth century, the individual gene could not be seen, but could be worked with fruitfully.
选项 A、blindly
B、completely
C、productively
D、carefully
答案C
解析
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