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Ivan
3 years ago
10

What was one of the challenges doctor Salk faced in his attempt to create a polio vaccine ?

English
1 answer:
Oliga [24]3 years ago
4 0
To do surgery well I think
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Any statement that is talking about the future is considered as future tense. We know that this statement is future tense because we can see the keyword “will”. This implies that they are talking about the future.

I recommend that you research more on these keywords as they will help you a lot in the future. Have a good day!

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