问题
选择题
So fast ________ that I could not catch up with them. [ ]
A. did they run
B. they had run
C. they ran
D. had they run
答案
答案：A
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So fast ________ that I could not catch up with them. [ ]
A. did they run
B. they had run
C. they ran
D. had they run
答案：A