— I phoned you at about three this afternoon but no one answered.— Oh that was probably

问题补充：

— I phoned you at about three this afternoon, but no one answered.

— Oh, that was probably I was doing exercise outdoors.

A. when

B. why

C. what

D. that

答案：

(答案→)A. when

B. why

C. what

D. that

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