几道单选题
Manythings__impossibleinthepastarequitecommontoday.
A,havingbeenconsideredB.tobeconsideredC.consideringD.considered答案为D,A和B行不行?请解释详细点.
Themanwaswaitingtoseetheproblem__A.settleB.settledc.tosettled.settling答案为b,有seesth.done?A为什么不对?
邮箱: 联系方式: