When I first met Ann, she _____ (work) in Samsung ...

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When I first met Ann, she _____ (work) in Samsung for 15 years.

A. had been working

B. have been working

C. worked

D. had worked

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The doctor asked me how long _______ (have) the symptoms before I came to check it.

A. had having

B. had been had

C. had been have

D. had been having