So fast that I could not catch up with them. [ ] A.did they run B.they had run C
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![So fast that I could not catch up with them. [ ] A.did they run B.they had run C](/pic/43_786043.jpg)
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
试题答案
答案:A