The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox, which caused only a mild illness, they are immune from smallpox.
A. which caused only a mild illness, they are immune from
B. causing only a mild illness, they become immune from
C. which causes only a mild illness, they are immune to
D. causing only a mild illness, they became immune from
E. which caused only a mild illness, they would become immune to
Correct Answer Below (so you don’t see it while reviewing the question)
Correct Answer: E
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