mysister()thearmylastyear A: joinned B: joined C: hasjoined D: didjoin

Mysister’sprofessorhadher______herpapermanytimesbeforeallowinghertopresentittothecommittee. A: rewritten B: torewrite C: rewrite D: rewriting

Mysister（）toseemeyesterday.【come】　　我姐姐昨天来看我了。

Mysister,aninexperiencedrider,wasfoundsittingonthebicycle____________tobalanceit. A: havingtried B: trying C: totry D: Tried

Mysister _____ breakfast at home this morning. A: hasn’t B: don’t have C: doesn’t have D: didn’t have