Question

—What do you think of genetically modified food (轉基因食品)?
—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               

             
試題分析： 考查代詞與介詞。句意：你認為轉基因食品如何呢？我們一直認為科學家在做實驗之前說這是安全的，這事是很粗心的�？疾閕t be +adj+of sb to do，it做形式主語，真正的主語是后面的不定式，of用來表達某人品質或特性， 所以選C項。