I went to the box office at lunch-time, but ...

★ Perfect Tense

I went to the box office at lunch-time, but they had already sold all the tickets.

A. past perfect tense

B. simple past tense

C. present perfect tense

D. past perfect continues

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They __________________ in California ____________ they moved here.

A. were / since

B. have been / since

C. have been / for

D. were / for