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 |
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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 |
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