30. They _ very tired because they _ since early morning. a) are / have been working b) have been / work c) are / work d) have been / have worked

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They are very tired because they have been working since early morning. (Они очень устали, потому что работают с раннего утра.)

Состояние описывается формой are, а длительное действие с since early morning — формой Present Perfect Continuous have been working.

30. They ___ very tired because they ___ since early morning. a) are / have been working b) have been / work c) are / work d) have been / have worked