---Hi, Joan, I haven’t seen you for ages．What ________ recently?

---Carrying on some research on wildlife．


  1. A.
    did you do
  2. B.
    have you done
  3. C.
    were you doing
  4. D.
    have you been doing
D
答句是個省略句，完全形式應為“I have been carrying on some research on wildlife．”。由此可知應用現(xiàn)在完成進行時。
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