_ the flight to Beijing will be delayed is ___ I’m especially worried about.A．If; what B．Whether; that C．When; that D．Whether; what

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_____ the flight to Beijing will be delayed is _______ I’m especially worried about.
A．If; what B．Whether; that C．When; that D．Whether; what

_____ the flight to Beijing will be delayed is _______ I’m especially worried about.A．If; what B．Whether; that C．When; that D．Whether; what