Question

Had I known about this computer program, a huge amount of time and energy       .

A．would have been saved	B．had been saved
C．will be saved	D．was saved

Answer 1

A

試題分析：考查虛擬語氣，表示與過去事實相反的情況。其句型為“ if + 主語 + 動詞的過去完成式，主語 +would / could / should / might + have + 動詞的過去分詞”。這道題里從句Had I known about this computer program是省略了if 然后倒裝的="If" I had known about this computer program. 主句中a huge amount of time and energy和save是被動關系，所以用would have been saved.句意：如果我（早）知道這計算機程序，就能節(jié)約大量短時間和精力了，選A。
點評：虛擬過去時是表示與過去事實相反的假設，if 從句的謂語形式用過去完成時即had＋過去分詞，主句用would / should / could / might + have +過去分詞，有時可以把含有助動詞、情態(tài)動詞、be或have的虛擬條件句中的連詞if 省去，而將had , should, were 等詞提到主語之前，即用倒裝結構。這題就是用的這個形式。