Question

________ he driven more carefully, the accident would not have happened the other day.

1. A.
   Be
2. B.
   Had
3. C.
   Has
4. D.
   Would have

Answer 1

B
解析：
考查虛擬語(yǔ)氣�！叭绻�他開車在小心一點(diǎn)，事故就不會(huì)發(fā)生了。”根據(jù)主句的would not have happened可知，與過(guò)去相反，故用過(guò)去完成時(shí)，即If he had driven...，If引導(dǎo)的虛擬語(yǔ)氣常用省略形式，把had提前，即Had he driven...。故選B。