He always lacks enthusiasm in work，and he's never ________a job for longer than a few weeks.
| A．held down |
| B．held up |
| C．held off |
| D．held on to |
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He always lacks enthusiasm in work，and he's never ________a job for longer than a few weeks.
| A．held down |
| B．held up |
| C．held off |
| D．held on to |
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