3. Choose the right form of the verb to complete the sentences.

1.My little brother ________ that Santa Claus doesn’t exist.
a) has just discovered b) has been discovering
2. The weather is so gloomy this week. It _______ 3 days already. And it is still raining this morning.
a) has rained b) has been raining
3. “ Who ______ on my chair?” – asked a little bear when he saw that his favourite chair was broken.
a) has sat b) has been seating
4. I ______ her for a long time.
a) have known b) have been knowing