In the first decades of the 20th 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 20th 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 fruitfully意为“有成效的,有结果的”。
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