— Alvin, are you coming with us?
— I'd love to, but something unexpected ________.
| A．has come up |
| B．was coming up |
| C．had come up |
| D．would come up |
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— Alvin, are you coming with us?
— I'd love to, but something unexpected ________.
| A．has come up |
| B．was coming up |
| C．had come up |
| D．would come up |
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