They were ________ busy ________ with each other ________ the time.
| A．too, to talk, to forget |
| B．too, talking, to forget |
| C．so, to talk, that they forgot |
| D．so, talking, that they forgot |
They were ________ busy ________ with each other ________ the time.
| A．too, to talk, to forget |
| B．too, talking, to forget |
| C．so, to talk, that they forgot |
| D．so, talking, that they forgot |
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