题文
David apologized for to inform me of the change in the plan.
| A．he was not able |
| B．he was not to be able |
| C．his not being able |
| D．him not to be able |
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David apologized for to inform me of the change in the plan.
| A．he was not able |
| B．he was not to be able |
| C．his not being able |
| D．him not to be able |
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