问题补充:
单选题Questionsandexercisesaregivenbythecomputer,whichdecides______tomovethestudentsahead,reviewaneasierlevel,____givemoreworkonthesamelevel.A.either, orB.both, and .C.whether, orD.not only, but also
答案:
C解析Whether---or·---表选择。问题的给出是为了决定是提高水平还是做同一水平的题。故选C。