来自刘佐尤的问题
时态语态问题Iwon’ttellthestudenttheanswertothemathproblemuntilhe____onitformorethananhour.vA.hasbeenworkingvB.willhaveworkedvC.willhavebeenworkingvD.hadworked要说明理由v
时态语态问题
Iwon’ttellthestudenttheanswertothemathproblemuntilhe____onitformorethananhour.
vA.hasbeenworking
vB.willhaveworked
vC.willhavebeenworking
vD.hadworked
要说明理由
v
