. --So hard __________ in the past few months that he has made great progress in English.
--I can see that, only a few mistakes he made in this exam.
A. he worked B. did he work
C. he has worked D. has he worked
科目:高中英语 来源:同步题 题型:单选题
A. and
B. so
C. but
D. or
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