摘要： I a letter when my mother came in. A. write B. am writing C. was writing D. will write
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—Sorry, Doctor Smith isn’t here right now.
—May I ____ a message on his desk?
A. take B. leave C. haveD. bring
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----- Did you go to Sam's weekend party?
----- No, I ______________.
| A．am not invited | B．wasn't invited |
| C．haven't invited | D．didn't invite |