The 24-year-old has established himself as one of the best centre-backs in European football over the past three seasons, during which he helped Jurgen Klopp's side win successive Bundesliga titles in 2011 and 2012. Why is 'during' written next to 'which' like this ?
Top answer
during which means during the past three sessions.
— Yoong Liat
during which means during the past three sessions.
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