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

问题补充：

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

--- Oh, that was probably I was seeing the doctor.

A. when

B. why

C. what

D. that

答案：

(答案→)A. when

B. why

C. what

D. that

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