单选题 17.I know he failed his last test, but really he's______stupid.
【正确答案】 B
【答案解析】but一般显然不与something和not搭配；anything but表示“绝不，并不”，如：Iwill do anything but go there．我决不到那里去。nothing but意为“只”。显然，B项正确。