you do the experiment carefully, you would make discoveries others wouldn’t make.A. Shoul

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(答案→)A. Should
B. Would
C. Could
D. Might
解析：句意：如果你仔细的做实验，就会有别人没有的发现。主句用了would do表示和将来相反的虚拟语气，条件状语从句也是和将来相反的虚拟语气，用should do，did或were to do，可以省略if，提前should或were，所以选A。