The customer --------- complained through a variety of channels before ...

★ Tenses and Word Formation

The customer ——— complained through a variety of channels before leaving a negative review on the Web site.

A. had

B. did

C. was

D. will

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Carl apologizes for not being available when you called, but he ———- an important client.

A. had visited

B. visited

C. was visiting

D. had been visiting