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

答案：B
解析：

本题考查表语从句的用法。分析句子意思知，此处用when引导表语从句，表示“你在给我打电话时我在看医生”。