单选题The first thing ________&

问题补充：

单选题Thefirstthing________Ididwastoseeiftherewereanyproducts________mighthelpme,butthereonlyseemedtobepowders________tokillsnakes.A.that; /; designedB.which; that; designedC./; that; designedD./; which; design

答案：

C解析考查定语从句和分词用法。第一空省略that/which, that/which指代先行词the first thing作为did的宾语；第二空that指代any products在句中做主语，不能省略。Design与powders构成被动关系，所以使用过去分词。