It happens that I am quite familiar with the professor _______ to give us a speech on environmental protection next Monday.
| A．inviting | B．to be invited |
| C．being invited | D．having invited |
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It happens that I am quite familiar with the professor _______ to give us a speech on environmental protection next Monday.
| A．inviting | B．to be invited |
| C．being invited | D．having invited |
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