Выполните грамматические упражнения на Present Perfect Continuous
(раскройте скобки)
1 The grandfather (take) this medicine for months. 2 How long the examiners ( ask) students? 3 This
system (not work) for many years. 4 They (wait) for a long time? 5 Fres and Kelly (stay) in the country
for the whole summer.
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