Man’s understanding of nature is developing ________. It never stays at the same level.
| A．at the right time | B．for the first time |
| C．from time to time | D．all the time |
Man’s understanding of nature is developing ________. It never stays at the same level.
| A．at the right time | B．for the first time |
| C．from time to time | D．all the time |
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