– I rang you at about ten o’clock but there was no reply. – Oh that was probably I was

问题补充：

– I rang you at about ten o’clock, 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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