题文
They failed to finish the project before the deadline. I regretted __________.
| A．to be not able to help | B．being not able to help |
| C．being unable to help | D．not to be able to help |
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They failed to finish the project before the deadline. I regretted __________.
| A．to be not able to help | B．being not able to help |
| C．being unable to help | D．not to be able to help |
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