Question

28. When preparing for exams, perseverance and efficiency are "            to achieve good grades. (take)

当为考试做准备的时候，毅力和效率是获得好成绩所需的。

Answer 1

28. what it takes考查it作形式主语的用法。在it takes sb. / sth. ... to do sth.中，it作形式主语，代替后面的不定式的内容。本题为表语从语，要注意语序。类似这样it作形式主语的用法还有：it is adj. / n.(for sb.) to do sth.;it is adj. / n. that...;it is said / believed / reported... that...。