问题: 语法题
The engineers and the workers have overcome a lot of difficulties ( )some new products.
A.they had to develop B.to have developed
C.they had developing D.having developed
解答:
The engineers and the workers have overcome a lot of difficulties ( C)some new products.
A.they had to develop B.to have developed
C.they had developing D.having developed
主干: The engineers and the workers overcome difficulty.
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