Question

I could have helped the old man ______ yesterday morning.

A．did I come

B．if I came

C．had I come

D．if I should come

Answer 1

C

試題分析：句意:如果我昨天來的話我就能幫助那位老人。這是省略if的條件狀語從句，并且是虛擬語氣，從句中有過去的時(shí)間狀語，所以對過去的虛擬謂語應(yīng)該用had done，省略if時(shí)，把had提到主語的前面，故選C。
點(diǎn)評：本題難度適中。虛擬語氣是高中階段的重要語法項(xiàng)目，需要考生牢記各種情況的虛擬語氣的謂語動(dòng)詞的形式，并要有分析理解語境的能力。
即學(xué)即練：______ smoking, he would not have got cancer in the lung.
A. Was he given up B. Had he given up
C. Did he give D. If he gave up
解析：B。由于主句謂語是would not have got，這表明是對過去事實(shí)作出的假設(shè)，所以從句謂語應(yīng)該是 had given up，而不是像D項(xiàng)那樣用一般過去時(shí)。另外，當(dāng)虛擬條件句中有 had, should, were 等詞時(shí)，通常可以省略 if，并將 had, should, were 提前置于句首。