选择B,如果要否定回答应该是I don't think so,不能说I think not.多以不选D ,选B意思是我是这样认为的.可是我们老师以前说过I think not=I don‘t think so的呀？I THINK NOT是我认为不，否定的部分不一样I THINK NOT 我认为不I don't think so.我认为不是。 有什么区别？一般正确用法是I think so./I don't think so，否定think是要前置的，所以I THINK NOT 是非正规回答，建议你选B