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
Solution (Posted on 16th):
The best answer is D. The phrasing polio contracted when they were children correctly uses contracted to modify polio and includes a pronoun and a verb that refer unambiguously to their antecedent, patients.
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