--So you know Della?--Yes,it was last week____ I surfed the

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--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
再问：做时间状语，不是能加介词吗，这个应该加个什么介词啊？
再答：有个语法规则的 last/this/yesterday 等 + week/morning 等不用加介词表示时间介词at, on, in 的省略 (1) 在 next, last, this, these, today, yesterday, tomorrow, one, every, each, all等词前,一般不用 at, in, on.

--So you know Della?--Yes,it was last week____ I surfed the —So you know Della?—Yes,it was last week I surfed the Intern 英语翻译what did you do last night?i surfed the internet.how oft if you don't know the answer ,say A SO B NO C YES D IT do you know Tom has passed the final examat last? yes, I fel Do you know Mr.White got married last week? Yes,I am the fir did you enjoy the concert last weekend?yes,very much.it was --Did you hear the loud thouder last night.--yes,it was at a 急...--did you hear the loud thunder last night--yes,it was a did you go to the movie last night____?yes,it was really won Do you know who ( )Australia?Yes.It was Cook i was absent at the time,so i don't know how it ( )加什么?happe