5. He will never _______ though every means ________ tried already.
| A．lose heart; has been | B．lose heart; have been |
| C．lose his heart; was | D．lose his heart; had |
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5. He will never _______ though every means ________ tried already.
| A．lose heart; has been | B．lose heart; have been |
| C．lose his heart; was | D．lose his heart; had |
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