A: Why ________ the police _____________ (interview) Martin at the moment? B: He __________ (witness) the burglary next door last night.
are ... interviewing / witnessed
A: The oil company ____________ (pour) waste into the lake for years before they were caught. B: Yes, it's terrible to think of the damage it ____________ (cause) so far.
had been pouring / has caused
A: I ____________ (watch) TV yesterday and I saw a documentary about the plight of the homeless. It really had an impact on me. B: I know what you mean. I ____________ (already/know) about the problem , but it still affected me as well.
was watching / already knew
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