--- Why!I get you on the phone.
--- We basketball on the playground when you phoned.
| A．didn’t;must be playing |
| B．couldn’t;must be playing |
| C．couldn’t;must have played |
| D．didn’t; must have been playing |
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--- Why!I get you on the phone.
--- We basketball on the playground when you phoned.
| A．didn’t;must be playing |
| B．couldn’t;must be playing |
| C．couldn’t;must have played |
| D．didn’t; must have been playing |
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