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Ответ:

В 194 последний вариант:

Helen has been working all day. She looks very tired.

В 195 последний вариант:

Kate has been studying hard recently. She is taking her exam next month.

В 196 первый вариант:

We have been working day and night on this project, so now it's time to relax and have some fun.

Объяснение:

В данных предложениях Present Perfect Continuos. Предложения в таком времени строятся с помощью Has/Have + been + глагол с ing окончанием.