I regret ______ that I’m too busy ______ in the talk.
| A．to say, to participate | B．saying, participating |
| C．to say, participating | D．saying, to participate |
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I regret ______ that I’m too busy ______ in the talk.
| A．to say, to participate | B．saying, participating |
| C．to say, participating | D．saying, to participate |
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