____ the flight to Beijing will be delayed is ____ I’m especially worried about.
A．If; whatB．Whether; thatC．When; thatD．Whether; what
D
考查主語從句和表語從句。句意:是否去北京的航班回推遲是我特別擔(dān)憂的事。第二空缺賓語故用what。所以選D。
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