题文
We were just calling you up _you came in.
| A．about; when |
| B．on the point of; while |
| C．on the point of; when |
| D．on the point of; as |
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We were just calling you up _you came in.
| A．about; when |
| B．on the point of; while |
| C．on the point of; when |
| D．on the point of; as |
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