[ Grammar and Vocabulary ]
How long ______________ studying food processing techniques for the company when he retired?
A. did Martin work
B. had Martin worked
C. had Martin been working

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During the meeting, the CEO ________ (interrupt) and ________ (announce) the company’s restructuring plan.
A. interrupted / announced
B. interrupted / was announcing
C. was interrupting / announced
D. was interrupting / was announcing