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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

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