the flight to New York will be delayed is I’m especially worried about.
A. If; what
B. Whether; that
C. When; that
D. Whether; what
网友回答
A. If; what
B. Whether; that
C. When; that
(答案→)D. Whether; what
解析：考查名词性从句。句中whether引导主语从句，句首不可用if，what引导表语从句，在从句中作宾语，选D。