How long ___ (you/dig) before you found the buried treasure? ...

★ Past Perfect Simple & Continuous

How long ___ (you/dig) before you found the buried treasure? (Past Perfect Continuous)

A. you had dig

B. you had been digging

C. had you been digging

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I ___ (cope) with my problem for weeks before I found a solution. (Past Perfect Continuous)

A. had been coped

B. had coped

C. had been coping