The average global temperature ____ for at least 100 years The average global temperature ____ every year for at least the last hundred years. It ____ a couple of times so far this year. It ____ since this morning. Researchers ____the phenomenon for a number of years Researchers ____the phenomenon on several different occasions He ____the washing maschine all morning He ____the washing machine already I ____French for ages - not since I left school We ____French for the past hour or so

present perfect vs present perfect continuous

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