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Exercise : Simple Past Tense and Present Perfect Tense

Jumat, 15 Januari 2016
Scientists 1) have found a set of genes passed down only by mothers that appear to influence the ageing process. The researches 2) discovered that damage to our microchondria - the tiny powerhouses in our cells that turn the food we eat into energy - speeds up age - related conditions. Greg Silverman, President,...
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