Diet and nutrition must have been a key factor
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18
Answer:
It must be her car, don't you think? According to [Swan, 1986]: If the main clause has be, this is also used in the question tag. If the main clause does not have an auxiliary verb (or be), do is used in the question-tag.
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6
Answer:
yes
Explanation:
yes why not they are very important factorof our life
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