Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
South African anti-apartheid veteran Winnie Madikizela-Mandela, ex-wife of late President Nelson Mandela, _______ in and out of hospital since 2016 for back and knee surgery.
A.has been being
B.has been
C.was
D.had been

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