Have you seen Mrs.Brown?选择 Have you seen Mrs.Brown? She was seen ___ the guests at the gate .Now she may be in the kitchen. a.to be greeting b.to greet c.greeting d.greet
选“C“ 。 was seen 完整理解应该是有人看到她当时在门口祝福"着"客人,是一种进行中的状态,所以不选“D”。至于A和B,因为是过去已经发生了的事情,现在还有可能正在发生着,所以后面不能有“To”. 如果是 She was told to be greeting the guests at the gate。。。这种情况下应该选A 语法学的不好,解释的不一定有道...