He_____________five letters to the manager by the time he finally ...

★ Narrative Tenses

He_____________five letters to the manager by the time he finally received an answer.

A. wrote

B. was writing

C. had written

D. had been writting

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She _________ (spend) a long time training before she _________ (do) her first marathon.

A. had spent / did

B. was spending / had done

C. spend / did