--So you know Della?--Yes,it was last week____ I surfed the Internet.A.that B.when C.why如果是强调句的话，问句就应该是你什么时候认识的Della?

--So you know Della?--Yes,it was last week____ I surfed the Internet.A.that B.when C.why
如果是强调句的话，问句就应该是你什么时候认识的Della?

when 引导的定语从句 在从句中做时间状语