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

问题补充：

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

A. what，that

B. that，which

C. which，that

D. that，that

答案：

A. what，that

B. that，which

C. which，that

(答案→)D. that，that

解析：句意：就在一开始的时候Mr. Smith作出决定，我们派人去请医生。第一个空是强调句型，It is +强调部分+that+其它。第二个空是同位语从句，we should send for a doctor说的就是a decision的内容，此处只能用that起连接作用。故选D。