Present Perfect v. Present Perfect Continuous

I ____ English for two hours. I'm very tired.

• .

• have studied

• .

• have been studying

How long _____ this watch?

• .

• .

• have you worn

• have you been wearing

The roads are closed because it _____ since yesterday.

• .

• .

• has snowed

• has been snowing

William is my best friend. I ____ him for years.

• have been knowing

• .

• .

• have been known

It is 7 p.m. and Alfred ___ yet. He ___ in the field since morning.

• .

• hasn't returned / has been working

• hasn't returned / has worked

• .

You ___ piano for years but you still can't play a single song.

• .

• have learnt

• .

• have been learning

She ___ out the window since she heard the bad news.

• .

• has been looking

• .

• has looked

What a talkative man! He ___ since morning.

• has talked

• .

• has been talking

• .

The bus hasn't come yet. We ____ for an hour.

• .

• have been waited

• have been waiting

• .

I ___ Daisy and her husband Dennis for fifteen years.

• .

• have been knowing

• have known

• .