Question

If you ______ firm action to deal with it at once, you wouldn’t suffer heavy losses tomorrow.

A．take

B．took

C．has taken

D．had taken

Answer 1

B

試題分析：考查if的非真實(shí)條件句：句意：如果你立刻采取有力的行動(dòng)解決它，明天你就不會(huì)遭受嚴(yán)重的損失了。主句是和將來(lái)相反，用would do表示虛擬，if條件句是和現(xiàn)在相反用過(guò)去時(shí)，表示虛擬，選B。
點(diǎn)評(píng)：虛擬語(yǔ)氣在條件句中的用法是：虛擬條件句與現(xiàn)在事實(shí)相反的假設(shè)，從句是If+主語(yǔ)+動(dòng)詞的過(guò)去式（動(dòng)詞be用were)，主句是：主語(yǔ)+should,would, might,could＋動(dòng)詞原形；與過(guò)去相反的假設(shè)從句用：If+主語(yǔ)+had +過(guò)去分詞，主句是：主語(yǔ)＋should, would, might, could ＋have done；與將來(lái)相反的假設(shè)，從句用1、If+主語(yǔ)+動(dòng)詞過(guò)去式，主語(yǔ)＋should, would  do，2、If+主語(yǔ)+were to+ 動(dòng)詞原形，加主句3、If+主語(yǔ)+should +動(dòng)詞原形，加上主句的might, could＋動(dòng)詞原形