A. seldom is George B. seldom George does C. seldom does George D. seldom looks George after Granny Wang
单项选择题How was （） they discovered the entrance to the underground palace Totally by chance.
A. it that B. he that C. it when D. he which
单项选择题This is an illness that can result in total blindness if （）．
A．to leave untreating B．left untreated C．1eaving untreating D．is left untreated
