Oneofthemostwidelydiscussedproblemsofrecentyearshascenteredaround____hascometobecalledthe“generationgap”.（） A: that B: what C: which D: how
Oneofthemostwidelydiscussedproblemsofrecentyearshascenteredaround____hascometobecalledthe“generationgap”.（） A: that B: what C: which D: how
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