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

當(dāng)為考試做準(zhǔn)備的時(shí)候，毅力和效率是獲得好成績所需的。

28. what it takes考查it作形式主語的用法。在it takes sb. / sth. ... to do sth.中，it作形式主語，代替后面的不定式的內(nèi)容。本題為表語從語，要注意語序。類似這樣it作形式主語的用法還有：it is adj. / n.(for sb.) to do sth.;it is adj. / n. that...;it is said / believed / reported... that...。

題目來源：高考丟分題英語 > 專題訓(xùn)練7:強(qiáng)調(diào)句、it的用法、主謂一致和句子種類

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