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