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--- I rang you at about ten, but there was no reply. --- Oh, that was probably I

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--- I rang you at about ten, but there was no reply. --- Oh, that was probably I

--- I rang you at about ten, but there was no reply.  
--- Oh, that was probably _____ I was seeing the doctor.[     ]A. for       
B. why       
C. when    
D. how

试题答案

C