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：考查主语从句和表语从句：句意：是否去纽约的航班要被推迟是我特别担心的，第一空填whether，连接主语从句，第二空填what，连接的是宾语从句，what在宾语从句中做宾语，选D.