38.Her English composition is much too perfect .She ________

38.Her English composition is much too perfect .She ________it herself,I bet.A．might have written
A,为什么
38.Her English composition is much too perfect .She ________it herself，I bet.
A．might have written B．can’t have written C．can’t write D．must have written
39.---When shall we meet your cousin at the station?
—His plane took off 2 hours ago，and it ________reach at 5 p．m..
　　　A．should x09x09B．could C．must x09x09D．can