--- The young man spent as much time as he the experiments.
--- No wonder he succeeded .
A. did; by the end
B. could doing; in the end
C. could doing; at the end
D. could to do; in the end
网友回答
A. did; by the end
(答案→)B. could doing; in the end
C. could doing; at the end
D. could to do; in the end
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