"Where is your sister?"<br/>"She's on a trip now. She left for France last week. She's coming back tomorrow.<br/><br style="color:#432100;"/><span style="color:#111111;">I (<b>asked / am asking / have asked</b>) her to buy some books."</span><br/><br style="color:#432100;"/><br/><span style="color:#111111;">In that context, which tense do you use?</span><br/>