. ---I must apologize for ___________ ahead of time. ---That’s all right.
| A．letting you not know | B．not letting you know |
| C．letting you know not | D．letting not you know |
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. ---I must apologize for ___________ ahead of time. ---That’s all right.
| A．letting you not know | B．not letting you know |
| C．letting you know not | D．letting not you know |
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