Question

— 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

Answer 1

B

解析试题分析：句意：--昨晚我打电话给你,但是没有人接电话。--哦，那很有可能我正在看医生。依据上下文was后应是表时间的表语从句，只能用when来引导。
考点: 考查表语从句关系词的用法。