. He apologized for _____.
| A．his not being able to come | B．his being not able to come |
| C．his being able not to come | D．him not being able to come |
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. He apologized for _____.
| A．his not being able to come | B．his being not able to come |
| C．his being able not to come | D．him not being able to come |
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