I ______ (to be) very tired because I ______ (to ...

★ Past Perfect vs Past Simple

I ______ (to be) very tired because I ______ (to study) too much.

A. were, had studied

B. had been, studied

C. was, studied

D. was, had studied

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Before he ______ (to sing) a song he ______ (to play) the guitar.

A. sang, played

B. had sung, had played

C. sang, had played

D. had sung, played