-Has the teacher finished marking the exam papers?-Sorry,I don't know.I just saw that he---(mark)them in the office yesterday .是填was marking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see sb doing和see sb do没有关系吧~
问题描述：
-Has the teacher finished marking the exam papers?
-Sorry,I don't know.I just saw that he---(mark)them in the office yesterday .
是填was marking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see sb doing和see sb do没有关系吧~
答