John cannot see off his sister at the airport.He has been seriously ill.
A. John’s sister wishes he hadn’t been seriously ill so that he couldn’t see her off at the airport.
B. As long as John could see his sister off at the airport,he couldn’t be seriously ill.
C. If John hasn’t been seriously ill,he can see off her sister at the airport.
D. If John were not seriously ,he could see off his sister at the airport.

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