If the researchers are successful they an important step in reproducing the way that huma

问题补充：

If the researchers are successful, they an important step in reproducing the way that humans use cognition（认识力）to interact（交流；互动）in their world．

A. make

B. would make

C. will make

D. will have made

答案：

A. make

B. would make

C. will make

(答案→)D. will have made

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