Question

I. Fill in the blanks with suitable tense form of the past perfect continuous:
1. They_______
(survey) for five years before they struck oil.
2.By 1977 she_________
(already)________
(work) in films for twenty years.
3. She___________
(look) after her sick husband for five years before his death.
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Answer 1

Answer:

1 had surveyed

2 had already worked

3:had looked

Answer 2

Answer:

(a) have surveyed

(b) has worked,worked

(c) has looked