It was at the very beginning Mr Smith made a decision we should send for a doctor.A. when

问题补充：

It was at the very beginning Mr Smith made a decision we should send for a doctor.

A. when; which

B. that; which

C. when; that

D. that; that

答案：

A. when; which

B. that; which

C. when; that

(答案→)D. that; that

解析：考查强调句型和同位语从句。第一空that与it was构成强调句型，强调时间状语at the very beginning,第二空是that引导的是同位语从句解释名词decision的内容，故D正确。句意：就是在开始的时候斯密斯先生做出了一件决定，我们要派人去请一个医生。故D正确。