几道英语选择题.急~~!The man hung up his telephone ______ I could guess who he was.
1.The man hung up his telephone ______ I could guess who he was.
A. when B.sinceC.not untilD.before
2.The ______ he has over the others is that he has been to Harvard University.
A.advantage B.effectC.affectD.interest
急求~~!答案及理由.好的加分.谢谢!