问题描述：
---Why do you run quickly in the early morning?
---( ) the school bus.You know,I always get up late.
A.Catch
B.To catch
C.Catching
D.Have caught
---( ) the school bus.You know,I always get up late.
A.Catch
B.To catch
C.Catching
D.Have caught
问题解答：
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