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Though he failed in the experiment again and again, he didn’t , and at last, he

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Though he failed in the experiment again and again, he didn’t , and at last, he

Though he failed in the experiment again and again, he didn’t______, and at last, he made it.

A. lose his heart                    B. lose heart   

C. break his heart                   D. make up his mind

试题答案

B

解析: