单项选择题
The pen（）on the floor for ten minutes, but no one has picked it up.
A．is lying B．has lain C．has been lying D．lay
单项选择题 —What do you think of the novel—Oh, excellent. It's worth（）a second time.
单项选择题 Sam: Was the driving pleasant when you went to Mexico last summerLili: No, it（）for four days when we arrived, so the roads were very muddy.
