Studies conducted in the 1990s indicate that even after fifty years, patients are still suffering the long term effects of polio occurring when a child.
A. contracted when a child
B. contracted when children
C. that was contracted when a child
D. contracted when they were children
E. that has been contracted as each was a child
OA D
Need some more inputs.
A. contracted when a child
B. contracted when children
C. that was contracted when a child
D. contracted when they were children
E. that has been contracted as each was a child
OA D
Need some more inputs.

















