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Anonymous Posted 18 years ago
Vocabulary

How is the immune system activated?

0I'm not sure which ones are correct.@@02br
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00 1.How is the immune system activated?02br
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00 2.How do the immune system be activated?02br
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00 3.How the immune system activated?02br
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00And is "the" in front of immune system redundant?02br
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00Thanks. 0-
  

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1 Answers
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0Only sentence 1 is correct, and the word 'the' is necessary.0-
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