Past perfect vs. Past perfect continuous

She was exhausted because she _______ all day.

• a) had worked

• b) had been working

• c) works

When I arrived at the party, my friends _______ already left.

• a) have

• b) had

• c) has

• d) having

They _______ for an hour before the taxi arrived.

• a) had been waiting

• b) waited

• c) had waited

Before she moved to Spain, she _______ some Spanish classes.

• a) has taken

• b) had been taking

• c) had taken

The ground was wet because it _______ all night.

• a) rained

• b) had been raining

• c) has rained

I was late for school because I _______ my bus.

• a) had missed

• b) miss

• c) had been missing

When we arrived, the teacher _______ the lesson.

• a) already started

• b) had been starting

• c) had already started

He was out of breath because he _______ for over an hour.

• a) had run

• b) was running

• c) had been running