Tom, as well as his father, in the sea when he heard someone calling for help just ahead of him.
| A．had swum | B．has swum |
| C．was swimming | D．is swimming |
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Tom, as well as his father, in the sea when he heard someone calling for help just ahead of him.
| A．had swum | B．has swum |
| C．was swimming | D．is swimming |
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