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World Languages, 22.04.2021 20:40 yadi64
Read the following line:
Three viruses caused polio, and a vaccine had to be effective against all of them.
In this context, the word effective means
A. neutral
B. successful
C. theoretical
D. virtual
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Answers: 3
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Read the following line:
Three viruses caused polio, and a vaccine had to be effective against all...
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