I started work at 6am. It's 6pm now, but I ...

★ Present Perfect Simple and Continuous

I started work at 6am. It’s 6pm now, but I am not finished.

A. I have been working for 12 hours.

B. I worked at 6am.

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Jack and Sue went to New Zealand last year for a holiday.

A. They have visited New Zealand.

B. They have been visiting New Zealand.