1) 1 a) is known b) is knowning 2) 2 a) are infected b) were infected 3) 3 a) being treated b) were being treated 4) 4 a) had been killed b) had killed 5) 5 a) is being done b) is doing 6) 6 a) be tested b) have been tested 7) 7 a) will be discovered b) will discover

Solutions Upper 6B

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