— 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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