—I rang you at about nine, but there was no reply.—Oh, that was probably I was seeing the

发布时间：2020-08-15 01:32:26

—I rang you at about nine, but there was no reply.
—Oh, that was probably     I was seeing the doctor.
A. why
B. when
C. what
D. that

网友回答

A. why
(答案→)B. when
C. what
D. that
解析：when引导表语从句，表示时间。故选B。
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