They were abroad during the months when we were carrying out the investigation, or they _____ to our help.
| A．would have come | B．could come |
| C．have come | D．had come |
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They were abroad during the months when we were carrying out the investigation, or they _____ to our help.
| A．would have come | B．could come |
| C．have come | D．had come |
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