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XII. Put the verbs in the present perfect or past perfect. Sometimes you need the negative.
1. Who is that woman? I __________ (never/ see) her before.
2. The house was dirty. They __________ (clean) it for weeks.
3. There was no sign of a taxi, although I __________ (order) one half an hour before.
4. You can have that newspaper. I __________ (finish) with it.