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

游客2024-10-17 21

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作名词work的后置定语。

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