I heard a knock at the front door so I ...

★ Past Simple, Past Continuous, Past Perfect, Past Perfect Continuous

I heard a knock at the front door so I ____ to answer it.

A. went

B. was going

C. had gone

D. had been going

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She ______ at that company for a year when she met James.

A. didn’t work

B. had been working

C. worked

D. was working