摘要： Most whales must come up for air after several minutes, a few can stay under water for an hour or more. A. while B. or C. for D. so
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Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
| A．while | B．or | C．for | D．so |
Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
| A．while | B．or | C．for | D．so |
Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
A．while B．or C．for D．so
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