问题补充：
---So hard_ in the past few months that he has made great progress in English.
---I can see that, only a few mistakes in this exam.
A. has he worked; did he make
B. he has worked; he made
C. he has worked; has he made
D. has he worked; he made
答案：
A. has he worked; did he make
B. he has worked; he made
C. he has worked; has he made
(答案→)D. has he worked; he made
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