You can't imagine what great trouble they have __________ the problem __________.
| A．to solve; being talked about | B．solving; discussing |
| C．to solve; to talk about | D．solving; being discussed |
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You can't imagine what great trouble they have __________ the problem __________.
| A．to solve; being talked about | B．solving; discussing |
| C．to solve; to talk about | D．solving; being discussed |
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