—Hi, John, I have not seen you for a long time. What _______ recently? 
—Carrying on some research on wildlife.

A. have you been doing
B. have you done
C. were you doing
D. did you do
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科目：初中英語 來源：期末題 題型：單選題

—Hi, John, I have not seen you for a long time. What _______ recently? 
—Carrying on some research on wildlife.
[     ]
A. have you been doing
B. have you done
C. were you doing
D. did you do

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