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
网友回答
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。