第30题: [单项选择]In spite of ______ has been said about genetically modified food, most people remain skeptical. A. which B. all that C. all what D. that 参考答案:B 答案解析:all在句中是代词,意为everything,在主句中作宾语。that引导了一个限定性的定语从句来修饰all。A、D两项错误是因为which和that都是关系代词,它们应紧跟在先行词之后,而句中却没有