The first detailed study of magpie attacks in Australia indicates thatby the time they had reached adulthood, 98 percent of men and 75 percent of women born in country have been attacked by the birds.
a) by the time they had reached adulthood, 98 percent of men and 75 percent of women born in country have been attacked by the birds.- we need past perfect "had been" here not present perfect "have been"
b) by the time they reach adulthood, 98 percent of men and 75 percent
...
a) by the time they had reached adulthood, 98 percent of men and 75 percent of women born in country have been attacked by the birds.- we need past perfect "had been" here not present perfect "have been"
b) by the time they reach adulthood, 98 percent of men and 75 percent
...
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