Question

—What do you think of genetically modified food (转基因食品)?
—We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.

A．that, for

B．it, for

C．it, of

D．that, of

Answer 1

C               

             
试题分析： 考查代词与介词。句意：你认为转基因食品如何呢？我们一直认为科学家在做实验之前说这是安全的，这事是很粗心的。考查it be +adj+of sb to do，it做形式主语，真正的主语是后面的不定式，of用来表达某人品质或特性， 所以选C项。