they_(build)this house since 2005 but it is still incomplete.
1.has been building
2.have been building
3.are building
4.had been building
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they_(build)this house since 2005 but it is still incomplete.
1.has been building
2.have been building
3.are building
4.had been building
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They have been building this house since 2005 but it is still incomplete.