all these people have in mon is they have succeeded.
A. What; that
B. That; what
C. That; that
D. What; what
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(答案→)A. What; that
B. That; what
C. That; that
D. What; what
解析：本题考查名词性从句。句中第一个what引导主语从句，在从句中作宾语；第二个that引导表语从句，从句中不缺少任何成分。故选A。句意：这些所有人共同之处是他们已经成功了。