90
8. I felt I___ , but there was nobody in the sight. A had watched B was watched C was being watched D had been watching 9. Look at him! He____ the same clothes for years. A wears B has been wearing C had worn D had been wearing 10. Coal plants __ one of the worst industrial polluters A had been, began B were, had begun C have been, began D were, have begun 90
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