They_______(study)English since they_______(be)7 years old.

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They_______(study)English since they_______(be)7 years old.
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They_______(study)English since they_______(be)7 years old.
They_______(study)English since they_______(be)7 years old.

They_______(study)English since they_______(be)7 years old.
have studied were

have been studying were

have were

They have studied English since they were 7 years old.