2. 外语
  3. In many areas, rapid development is the result of ______ in the research laboratory.

In many areas, rapid development is the result of ______ in the research laboratory.

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问题 In many areas, rapid development is the result of ______ in the research laboratory.
选项 A、work to do
B、work done
C、doing work
D、work doing
答案B
解析 这里是过去分词做名词work的后置定语。
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