--- The young man spent as much time as he the experiments. --- No wonder he succeeded .A

问题补充：

--- 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

答案：

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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