-Hastheteacherfinishedmarkingtheexampapers?
-Sorry,Idon'tknow.Ijustsawthathe---(mark)themintheofficeyesterday.
是填wasmarking还是marked
可是yesterday是标志着前面的see是过去时,而且这是一个从句,不是一个短语,与seesbdoing和seesbdo没有关系吧~