单项选择题
A．hardly sees his sister B．sees his sister only at Christmas time C．sees his sister on Jack's birthday D．always sees his sister
A．only remembers one of Jack's seventeenth birthdays B．always sends Jack something on his birthday C．has forgotten all of Jack's birthdays D．has forgotten Jack's seventeenth birthday
A．Scientists consider apes may drive trains some day. B．Apes have worked in some factories. C．Apes may one day be used to gather crops. D．An ape is not a large monkey.